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“Even if evolution has tilted the balance toward our brains rewarding ‘like’ and distrusting ‘difference,’ this need not be destiny,” says the Geisel School of Medicine’s Leslie Henderson in a Conversation opinion piece about the ways people react to those they consider in-groups and those they consider outsiders.

Henderson is the senior associate dean for faculty affairs, a professor of physiology and neurobiology, and a professor of biochemistry at Geisel. She is also a Dartmouth Public Voices fellow.