Enamel is hardest substance in the human body.
61
A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
25
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
The whiter your tongue, the more germs there are on it.
88
Your ears secrete more earwax when you are afraid than when you aren't.
229
It takes 17 muscles to smile, 43 to frown.
65
You mostly breathe from only one nostril at a time!
75