The adult human brain weighs about 3 pounds (1,300-1,400 g).
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If your DNA was stretched out it would reach to the moon 6,000 times.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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A man's beard grows fastest when he anticipates sex.
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It takes twice as long to lose new muscle if you stop working out than it did to gain it.
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Every human spent about half an hour as a single cell.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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