Fifteen facial muscles contract during laughter, and there is electrical stimulation of the major muscle of the mouth in particular. (Bartekian, Vatche. Laughter Can Cure What Ails You.)

While a person can feign a smile, it is more difficult to do so with laughter since laughter involves involuntary systems. (Goleman, Daniel, PhD, with Richard Boyatzis, and Annie Mckee. Primal Leadership. p 12. Boston: Harvard Business School Press, 2002.)

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