Harvard psychologist Steven Pinker shares five key insights from his brand new book, When Everyone Knows That Everyone Knows. He reveals how “common knowledge” — the hidden force of knowing what others know — shapes everything from financial bubbles and political revolutions to why we say “Netflix and chill.” Then we revisit our 2021 conversation with Steve about rationality, where he explains why smart people believe dumb things, why we're terrible at assessing risk, and how our species can be both brilliantly rational and spectacularly irrational at the same time.

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