Only humans shed emotional tears.
331
A person can live without food for about a month, but only about a week without water.
156
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
1k
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
You can't tickle yourself.
29