Researchers at the University of Virginia once set out to explore a certain theory about friendship. They strapped heavy backpacks onto a group of volunteers and one by one positioned each person in front of a big hill, as if they were going to climb it. Each volunteer was asked to estimate how steep it was. Half of them stood alone in front of the hill; the other half stood next to someone they’d identified as a friend. And consistently, those who were with a friend viewed the hill as less steep, the climb ahead less difficult. When people who’d been friends a long time stood in front of the
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