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
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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Poor eyesight (myopia) is associated with higher IQ.
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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.
233
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.
15
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
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