Enamel is the hardest substance in the human body.
The human body makes anywhere from 1 to 3 pints of saliva every 24 hours.
In America, the most common mental illness is Anxiety Disorders.
People with allergies can lower allergy reactions by laughing.
For humans the normal pulse is 70 heartbeats per minute.
The liver performs more than 500 different functions, including storing vitamins and removing harmful chemicals from the blood.
On average, a man spends about five months of his life shaving.
The number one cause of rabies in the United States are bats.
It has been medically been proven that laughter is an effective pain killer.
The eyeball of a human weighs approximately 28 grams.