Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
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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The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
A human being loses an average of 40 to 100 strands of hair a day.
133
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
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