Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The largest cell in the human body is the female egg and the smallest is the male sperm.
682
You can't tickle yourself.
29
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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A man's beard grows fastest when he anticipates sex.
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By weight, Bone is five times stronger than steel.
417
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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