Enamel is hardest substance in the human body.
61
On average a woman has 4 sexual partners in her lifetime.
-143
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
If your DNA was stretched out it would reach to the moon 6,000 times.
256
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
On average, there's 100 billion neurons in the human brain.
83
In one day, adult lungs move about 10,000 litres of air.
11
Early American humans hunted car-size armadillos and used their shells for houses.
12