Laugh out Loud

Preschoolers laugh up to 450 times a day while adults laugh an average of only 15 times a day.

Whats in a laugh?
The neural circuits in your brain begin to reverberate. Chemical and electrical impulses start flowing rapidly through your body. The pituitary gland is stimulated; endorphines, which have the same chemical make up of morphine, race through your blood. Your body temperature rises half a degree, your pulse rate and blood pressure increase, your arteries and thoracic muscles contract, your vocal cords quiver, and your face contorts. Pressure builds in your lungs. Your lower jaw suddenly drops uncontrollabley, and breath bursts from your mouth at nearly 70 miles per hour.