The average sperm cell swims at 8 inches per hour.
4
The human brain is more active during sleep than during the day.
28
Human hair and fingernails continue to grow after death.
7
A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
25
The average person's skin weighs twice as much as their brain.
131
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
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
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103