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.
21
You have no sense of smell when you're sleeping!
72
Each nostril of a human being register smell in a different way. Smells that are made from the right nostril are more pleasant than the left.
38
Like fingerprints, everyone's tongue print is different!
71
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
Every day, the average person swallows about a quart of mucous.
5
Sitting straight upright in your chair is bad for your back. You should instead slouch at an angle of 135 degrees.
10