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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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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Poor eyesight (myopia) is associated with higher IQ.
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Obsessive nose picking is called Rhinotillexomania.
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Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
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A person can live without food for about a month, but only about a week without water.
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Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
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The average sperm cell swims at 8 inches per hour.
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