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[
{"category":"science","content":"Photosynthesis is the process by which plants convert light energy into chemical energy, using carbon dioxide and water to produce glucose and release oxygen as a byproduct.","attribution":"Science"},
{"category":"science","content":"Newton's first law of motion states that an object at rest stays at rest, and an object in motion stays in motion, unless acted on by an outside force.","attribution":"Science"},
{"category":"science","content":"DNA carries the genetic instructions for every living organism, encoded in a sequence of four chemical bases that pair together to form the famous double helix shape.","attribution":"Science"},
{"category":"science","content":"The theory of plate tectonics explains how the Earth's outer shell is broken into large plates that slowly drift over the mantle, causing earthquakes, volcanoes, and mountain formation.","attribution":"Science"},
{"category":"science","content":"Water is one of the few substances that becomes less dense as it freezes, which is why ice floats on top of liquid water instead of sinking to the bottom.","attribution":"Science"},
{"category":"science","content":"A black hole forms when a massive star collapses under its own gravity, packing so much mass into so small a space that not even light can escape its pull.","attribution":"Science"},
{"category":"science","content":"Vaccines work by training the immune system to recognize a weakened or partial version of a pathogen, so the body can respond quickly if it ever encounters the real threat.","attribution":"Science"},
{"category":"science","content":"The periodic table arranges chemical elements by increasing atomic number, grouping elements with similar properties into the same columns.","attribution":"Science"},
{"category":"science","content":"Sound travels as a wave of pressure through a medium such as air or water, and it cannot travel through the vacuum of space, since there are no particles to carry the vibration.","attribution":"Science"},
{"category":"science","content":"Evolution by natural selection describes how organisms with traits better suited to their environment tend to survive and reproduce more successfully, gradually shaping a population over many generations.","attribution":"Science, after Charles Darwin"},
{"category":"science","content":"The speed of light in a vacuum is approximately two hundred ninety nine thousand, seven hundred ninety two kilometers per second, and nothing with mass can reach or exceed it.","attribution":"Science"},
{"category":"science","content":"Mitochondria convert nutrients into a usable form of energy for the cell, which is why biology textbooks often call them the powerhouse of the cell.","attribution":"Science"},
{"category":"science","content":"The human body contains roughly thirty seven trillion cells, each one specialized to carry out one of hundreds of different jobs inside the body.","attribution":"Science"},
{"category":"science","content":"Marie Curie remains the only person to win Nobel Prizes in two different sciences, physics and chemistry, for her pioneering research into radioactivity.","attribution":"Science"},
{"category":"science","content":"Genetics research has shown that humans share about ninety-nine percent of their DNA with chimpanzees, the closest living relative to our species.","attribution":"Science"}
]
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