Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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A man's beard grows fastest when he anticipates sex.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The human brain uses approximately as much energy as a 10 watt light bulb.
120
Our eyes are always the same size from birth, but our nose and ears never stop growing.
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Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The world's shortest man measures only 21.5 inches.
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