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In 1997 two psychologists, Dacher Keltner at Berkeley and George Bonanno, published a study of 39 people whose husband or wife had died about six months earlier. Average age just under 49. Each one sat for a filmed interview about the marriage and the loss, and the researchers counted the laughs.
The laughs that counted were the real kind, the ones that reach the muscles around the eyes. Psychologists call it Duchenne laughter, after the French neurologist who mapped those muscles in 1862. People who laughed that way reported less anger and more enjoyment, and strangers who watched the tapes warmed to them.
Then the follow-up. Guess who was grieving less at fourteen months, and again at twenty-five? The ones who laughed.
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