Enamel is hardest substance in the human body.
61
Your fingernails grow faster in summer.
744
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
In one day, adult lungs move about 10,000 litres of air.
11
The human brain doesn't stop developing until about 25 years old.
102
Poor eyesight (myopia) is associated with higher IQ.
232
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307