David Dunning, a psychology professor at the University of Michigan, has devoted much of his career to studying the flaws in human thinking. It has kept him busy.

You might recognize Dunning’s name as half of a psychological phenomenon that feels highly relevant to the current political zeitgeist: the Dunning-Kruger effect. That’s where people of low ability — let’s say, those who fail to answer logic puzzles correctly — tend to unduly overestimate their abilities.

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