On average a woman has 4 sexual partners in her lifetime.
-143
Enamel is hardest substance in the human body.
61
Mushrooms are more closely related to humans than they are to plants.
47
The world's shortest man measures only 21.5 inches.
73
On average, there's 100 billion neurons in the human brain.
83
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
