People can generally tell if other people are friends when they overhear them laughing together. That’s what a scientist found several years ago. Recently, he performed a new experiment, this time to find out if people can understand other people’s relationships by overhearing their conversations. His goal was to study the signals that laughter and speech send to other people. Listen to learn more about the study and what it reveals about the role of laughter in human evolution.
Story Length: 2:22
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