In the south central African country of Zimbabwe, war trauma and high unemployment can leave people in despair—until they find hope on a bench. A friendship bench. Hopeless people can go there to talk with trained “grandmothers”—elderly women taught to listen to people struggling with depression, known in that nation’s Shona language as kufungisisa, or “thinking too much.”

The Friendship Bench Project is being launched in other places, including Zanzibar, Malawi, London, and New York City. “We were thrilled to bits with the results,” said one London researcher. A New York counselor agreed. “Before you know it, you’re not on a…