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.
22
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
In one day, adult lungs move about 10,000 litres of air.
11
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