Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Every human spent about half an hour as a single cell.
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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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The human eye blinks an average of 4,200,000 times a year.
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Babies crawl an average of 200m a day.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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The average sperm cell swims at 8 inches per hour.
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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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