Scientists say we can tell if people are friends just by listening to them laughing together — Quartz

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Imagine going to a networking event where no one is faking interest in one other. That’s essentially what socialization was like for our primitive ancestors, for whom laughter was both a sign of familiarity and an involuntary gesture. Along with the ability to speak, modern humans have evolved the ability to fake laughter by voluntarily…

via Scientists say we can tell if people are friends just by listening to them laughing together — Quartz