On average, there's 100 billion neurons in the human brain.
83
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
The average sperm cell swims at 8 inches per hour.
4
A man's beard grows fastest when he anticipates sex.
239
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
We share 70% of our DNA with a slug.
218