Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Your heart will pump about 212 million liters in its lifetime.
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In one day, adult lungs move about 10,000 litres of air.
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Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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The human brain doesn't stop developing until about 25 years old.
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Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
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