Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
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A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The only letter not appearing on the Periodic Table is the letter "J".
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Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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Aluminum used to be more valuable than gold!
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