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
25% of your bones are located in your feet.
12
Your heart rate can rise as much as 30% during a yawn.
69
Your body is creating and killing about 2.4 million red blood cells per second.
17
Fingernails grow fastest on the hand you favor.
44
People who sleep late have more mental stamina and can outperform early risers.
33