Regardless of your opinion of TV shows with laugh tracks, studies show that adding canned laughter after a joke makes people more likely to laugh along with it. That's because laughter, like other human emotions, is contagious. A few other mammals have demonstrated infectious emotion, too, but the kea of New Zealand is the first non-mammal species to show contagious emotion. When one kea "laughs," other keas laugh too.
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Written by Curiosity Staff April 11, 2017
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