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
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
A person can live without food for about a month, but only about a week without water.
156
If your DNA was stretched out it would reach to the moon 6,000 times.
256
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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89