There are about 1,400 different species of bacteria in your belly button.
10
On average, women have always lived longer than men.
195
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
On average, there's 100 billion neurons in the human brain.
83
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The average sperm cell swims at 8 inches per hour.
4
The average tastebud lives only 10 days before it dies and is replaced by a new one.
15