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Thursday, June 21, 2018, 3:05 p.m.

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Survival or silliness? The topic is touchy

In his 1984 essay “Laughter,” in the Journal of the American Medical Association, Dr. Donald W. Black points out that tickling is the only reflexive trigger for laughing; the others — “humor, incongruity, relief and sense of well-being” — are psychosomatic.

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