Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The average sperm cell swims at 8 inches per hour.
4
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
Your fingernails grow faster in summer.
744
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139