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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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
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The human sigh acts as a physiological reset button.
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The world's shortest man measures only 21.5 inches.
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If the human eye was a digital camera, it would have 576 megapixels.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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