The average sperm cell swims at 8 inches per hour.
76
One human hair can support 3 ounces.
191
When you take a step, you are using up to 200 muscles.
886
The human body contains over a billion miles of DNA.
147
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22