Enamel is hardest substance in the human body.
61
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
On average a woman has 4 sexual partners in her lifetime.
-143
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
If the human eye was a digital camera, it would have 576 megapixels.
25