Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The human eye blinks an average of 4,200,000 times a year.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
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Every human spent about half an hour as a single cell.
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Enamel is hardest substance in the human body.
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Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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