There are about 1,400 different species of bacteria in your belly button.
10
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
A person can live without food for about a month, but only about a week without water.
156
The human body contains over a billion miles of DNA.
147
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
The human sigh acts as a physiological reset button.
23
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