Shared pain increases trust and cooperation.

Pain is a key element of many cultural practices of group initiation – from the paddling of fraternities to ritual tattoos and piercings. But the role pain itself plays in these traditions remains unclear; no scientific studies have tested whether pain actually has social effects. Until now, that is! Here, the researchers inflicted pain on participants via sticking their hands in ice water, having them perform leg squats, or making them eat hot chili peppers. They found a link between pain and

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