Adam Grant, the teacher of organizational psychology at Penn, a noted Ted Talk speaker, and the author of best-selling books, was recently on NPR sharing two very different takes on the phenomenon of being wrong.

The first take concerned Adam himself when he was a teen-ager. He and a friend disagreed about a particular song in a Broadway musical. Each thought he was right. Eventually his friend summoned proof that he, the friend, was right. Adam was wrong. Adam could see the proof. Knew the proof was irrefutable. But could not get himself to acknowledge the error of his ways. His friend said: Adam, admit you are wrong. Adam could not bring himself to do it.