The group bonhomie evaporated. There was discomfort all around. We naturally gravitate toward those like us, and bringing in an outsider threw off that easy dynamic. Alliances shifted; the “in” group members who agreed with the new outsider’s views felt as if their social ties to the rest of the group were strained. The group members as a whole suddenly felt more pressure to justify their answers. These groups had more difficulty solving the murder mystery. They were less confident about the result. The process wasn’t pleasant. And yet, as it turned out, these mixed groups nailed the correct
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