After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Only humans shed emotional tears.
331
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Human hair and fingernails continue to grow after death.
7
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
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92