This is how happy spreads

Laughter is part of the universal human vocabulary. All members of the human species understand it. 

We’re born with the capacity to laugh.

One of the remarkable things about laughter is that it occurs unconsciously. You don’t decide to do it. While we can consciously inhibit it, we don’t consciously produce laughter. That’s why it’s very hard to laugh on command or to fake laughter. (Don’t take my word for it: Ask a friend to laugh on the spot.)

Laughter provides powerful, uncensored insights into our unconscious. It simply bubbles up from within us in certain situations.

By Robert Provine, Ph.D.