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
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
You see your nose at all times, your brain just chooses to ignore it.
30
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
199
If you hold farts in during the day, they'll just come out when you sleep.
16
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
32
A person can live without food for about a month, but only about a week without water.
156