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Laughter just might be the most contagious of all emotional experiences. Although laughter is one of the distinguishing features of human beings, little is known about the mechanisms behind it. Laughter is not limited to communicating mirth. It can be triggered by embarrassment and other social discomforts. Laughter may have evolved to facilitate bonding across large groups of people. In primates, the grooming process releases chemicals that help build social bonds; humans eventually came to live in groups that were larger than the grooming process allowed. Laughter, as well as speech, enables us to bond quickly and easily with a large community.

Although laughter is not generally under voluntary control, it has numerous health benefits. Bouts of laughter can boost the immune system, relax muscles, aid circulation, and protect against heart disease. It can abet mental health, too; laughter can lower anxiety, release tension, improve mood, and foster resilience.

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