Enamel is hardest substance in the human body.
61
One human hair can support 3 ounces.
191
Tigers can see 6 times better at night than humans.
305
On average a woman has 4 sexual partners in her lifetime.
-143
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
The average sperm cell swims at 8 inches per hour.
4
The average person will go on a date at least 100 times before they finally marry.
33