When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
A person can live without food for about a month, but only about a week without water.
156
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A man's beard grows fastest when he anticipates sex.
239