Lick your elbow.
It is impossible to lick your elbow.
More Humans Facts
About half of the bones in the human body are located in the hands and feet?
An average human heart beats about 70 times a minute, and each time it beats, it pumps about about a cupful of blood?
A person can live without food for about a month, but only about a week without water.
If the amount of water in your body is reduced by just 1%, you'll feel thirsty.
If it's reduced by 10%, you'll die.