Your body is creating and killing about 2.4 million red blood cells per second.
17
One human hair can support 3 ounces.
191
The average sperm cell swims at 8 inches per hour.
76
Enamel is hardest substance in the human body.
61
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
Chewing gum boosts your brain power.
285
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18