If you hold farts in during the day, they'll just come out when you sleep.
16
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
There are about 1,400 different species of bacteria in your belly button.
10
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
22
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
The human brain doesn't stop developing until about 25 years old.
102