After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
A human being loses an average of 40 to 100 strands of hair a day.
133
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
Only humans shed emotional tears.
331
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
You can't tickle yourself.
29
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15