Humans are one of the species who laugh. Laughter is a sense of feeling good, happy and joyful. It is a response to humour, comprising two parts, gestures and production of sound. A hearty laugh triggers changes in the various parts of the body like arm, leg and trunk muscles. Fifteen facial muscles contract when we laugh. Laughing is a kind of facial exercise. In extreme laughter, tear ducts also get activated. It has been proven that laughter can help fight illness and improve health.
What is a Laugh?
