Your heart will pump about 212 million liters in its lifetime.
26
The average person who stops smoking requires one hour less sleep a night.
79
The lense of the eye continues to grow throughout a person's life.
34
The human brain is insensitive to pain.
76
There are about 1,400 different species of bacteria in your belly button.
10
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18


