If you were to roll a lung from a human body and out flat it would be the size of a tennis court.
36
The average person who stops smoking requires one hour less sleep a night.
79
20 minutes after smoking a cigarette, blood pressure drops to normal.
37
The brain can stay alive for 4 to 6 minutes without oxygen. After that cells begin die.
193
The human brain doesn't stop developing until about 25 years old.
102
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Pain travels through the body at 350 feet per second!
23
Human hair and fingernails continue to grow after death.
7