Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
Cigarette smoke contains 4,800 chemicals, 69 of which cause cancer.
145
A person can live without food for about a month, but only about a week without water.
156
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Most dreams last only 5 to 20 minutes.
79
If you unfolded your brain, it would cover an ironing board.
42
Bearing a male child can alter a woman's brain by leaving male DNA that can persist for the rest of her life, making her less likely to suffer from Alzheimer's disease, promote tissue repair, and improve her immune system.
16
While 7 men in 100 have some form of color blindness, only 1 woman in 1,000 suffers from it.
50