The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
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Within three days of death, the enzymes that once digested your food begin to eat you.
22
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
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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.
21
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
In 1996, research found that having excessive body hair is linked to higher intelligence.
23