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.
21
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.
34
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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The average person's skin weighs twice as much as their brain.
131
Yawns are more contagious among people with closer relationships.
163
On average a woman has 4 sexual partners in her lifetime.
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In one day, adult lungs move about 10,000 litres of air.
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