By cataloging the steady march of human progress, the Harvard psychologist and linguist has become a very public intellectual. But the self-declared “polite Canadian” has managed to enrage people on opposite ends of the political spectrum. Steve Levitt tries to understand why. This episode originally aired on August 21st, 2020. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.