How Photosynthesis Works
Plants build themselves out of air. Photosynthesis uses light energy to split water and attach the hydrogen to carbon dioxide, producing sugar and releasing oxygen as the leftovers.
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What Is DNA, Simply Explained
DNA is a long molecule that stores instructions as a four-letter code. The code is copied when cells divide and read out in pieces when a cell needs to build something.
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Why Do We Get Sunburned?
Sunburn is not the sun heating your skin. It is ultraviolet light damaging DNA in skin cells, and the redness and pain are the body’s repair and cleanup response starting a few hours later.
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How Memory Works and Why It Fails
Memory is not a recording you replay. It is a reconstruction assembled each time from fragments, which is why confident recollections can be wrong in very specific ways.
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Why Coffee Keeps You Awake
Caffeine does not give you energy. It blocks the receptor that tells your brain how tired you are, so the tiredness is still there, you just stop receiving the signal.
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How Soap Actually Cleans
Soap molecules have a water-loving head and a grease-loving tail. That split personality lets them grab oil with one end and let water carry it away with the other.
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How Vaccines Work
A vaccine shows your immune system what a pathogen looks like without letting it cause the disease, so that meeting the real thing later is a recognition task instead of a fight from scratch.