Long before modern brain imaging technologies illuminated the neurophysiological mechanisms that make laughter contagious, William James (1842-1910) observed, "We don't laugh because we're happy, ...
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Scientists now know why laughter is so contagious
Our ultra-social brains mean that human emotional expressions are a lot more communicable than most of us realise. Indeed, we can often find ourselves sharing the emotional state of the people around ...
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