Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Pain travels through your body at 350 ft. per second.
36
One quarter of the bones in your body are in your feet!
36
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
India used to be the richest country in the world until the British invasion in the early 17th Century.
37