Human teeth are almost as hard as rocks!
47
Pain travels through the body at 350 feet per second!
23
Women buy four out of every 10 condoms sold.
71
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
The average tastebud lives only 10 days before it dies and is replaced by a new one.
15
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Wearing tight pants can lead to impotence in men.
120
The average sperm cell swims at 8 inches per hour.
76