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The idea behind hitting something when you feel stressed or angry is based on the theory of catharsis, says Dr. E. Blake Zakarin. "Venting your anger can bring about a release of that anger.”

“Loneliness is a route to depressive symptoms," says Dr. Philip R. Muskin. "In anybody, but certainly in older people, the more socially interactive you are, the less likely you are to be depressed.”

Dr. Maura Boldrini and her team studied hippocampal samples and found neurogenesis continues through adulthood.

The poll highlights that if gene editing of embryos ever moves into fertility clinics, there will be some hard choices about what non-fatal disorders should qualify, said Dr. Robert Klitzman.