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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It takes about 20 seconds for a red blood cell to circle the whole body.
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The human eye blinks an average of 4,200,000 times a year.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Your fingernails grow faster in summer.
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Pain occurs when sounds are above 130 db.
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