This is what scientist mean when they say we are a “social species” our brains are highly tuned to understand what people are feeling/saying through body language and vocalization. Working in a group means better survival odds, so if a group of people are having fun you’re brain desperately wants to be a part of the group and laughing is a no-brainer, low effort way to show you are amicable, not threatening, and want to cooperate with the group
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