Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The average sperm cell swims at 8 inches per hour.
4
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Gorillas can catch human colds and other illnesses.
205
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Your fingernails grow faster in summer.
744
It takes about 20 seconds for a red blood cell to circle the whole body.
102