Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Your heart pumps about 2,000 gallons of blood each day!
53
There are 206 bones in the human body!
-17
When your face blushes, the lining of your stomach turns red, too.
154
About half of all Americans are on a diet on any given day.
29
Your wounds heal faster if you lick them, you instinctively do this for that reason. Tears help, too.
20
One quarter of the human brain is used to control the eyes.
43