The first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face.
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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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If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
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Identical twins do not have identical fingerprints.
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A chance of a woman having twins is increased after the age of 35. About 1 in 27 women will give birth to twins after this age. After 50 the chances of having twins is 1 in 9.
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