Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
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One human hair can support 3 ounces.
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Only humans shed emotional tears.
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The world's shortest man measures only 21.5 inches.
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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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