If you were to roll a lung from a human body and out flat it would be the size of a tennis court.
36
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
Your ribs move about 5 million times a year, every time you breathe!
60
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
The skin on your lips is 200 times more sensitive than your fingertips.
345
The average office desk has 400 times more bacteria than a toilet.
22