Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
You see your nose at all times, your brain just chooses to ignore it.
30
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
The human sigh acts as a physiological reset button.
23
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
A person can live without food for about a month, but only about a week without water.
156
