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.
21
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62