If you were to roll a lung from a human body and out flat it would be the size of a tennis court.
36
Human teeth are almost as hard as rocks!
47
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
Women buy four out of every 10 condoms sold.
71
Foreign accent syndrome is a rare brain disorder which causes people to speak in a foreign accent involuntarily.
15
The right lung takes in more air than the left.
30
The human brain doesn't stop developing until about 25 years old.
102
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13