Steven Pinker Interview: Common Knowledge, Social Norms, DEI, and Human Behaviour

In this week’s podcast, Iona Italia interviews linguist and psychologist Steven Pinker, the Johnstone Family Professor of Psychology at Harvard and author of thirteen books on language, cognition, and human nature. Today, we discuss his latest book, When Everyone Knows That Everyone Knows…: Common Knowledge and the Mysteries of Money, Power, and Everyday Life. In this conversation, we explore the concept of common knowledge—a powerful but often misunderstood idea at the heart of language, social norms, politics, and human relationships. Why is shared knowledge not enough for coordination? How do revolutions happen—or fail? Why do we rely on indirect speech, humour, and plausible deniability in everyday life? Topics include: Common knowledge vs. widely shared knowledge Social coordination, power, and political change The psychology of humour, embarrassment, and signalling Pluralistic ignorance and the “spiral of silence” DEI, conformity, and hidden dissent Classic logic puzzles and human reasoning From Shakespeare to Seinfeld, this episode explores how humans navigate complex social realities. 00:00 Understanding Common Knowledge 02:22 The Role of Common Knowledge in Coordination 05:41 Common Knowledge and Power Dynamics 08:40 Social Media, Coordination, and Control 11:13 Pluralistic Ignorance and Social Change 12:48 Plausible Deniability in Communication 15:06 The Complexity of Social Relationships 17:30 Humor and Common Knowledge 23:41 The Nature of Laughter and Social Bonds 27:09 The Nature of Laughter and Humor 32:29 Common Knowledge and Social Dynamics 34:34 Navigating Social Awkwardness 39:06 Logic Problems and Common Knowledge 45:35 Coordinated Communication Challenges ----- Quillette is an Australian-based online magazine that focuses on long-form analysis and cultural commentary. It is politically non-partisan, but relies on reason, science, and humanism as its guiding values. Quillette was founded in 2015 by Australian writer Claire Lehmann. It is a platform for free thought and a space for open discussion and debate on a wide range of topics, including politics, culture, science, and technology. Quillette has gained attention for publishing articles and essays that challenge modern orthodoxy on a variety of topics, including gender and sexuality, race and identity politics, and free speech and censorship. --- Quillette's revenue comes from our readers. We are a grassroots organisation that relies on voluntary subscriptions and community membership as our primary revenue stream. Support Quillette by becoming a subscriber: https://quillette.com/#/portal/signup Or donate send us a one-off tip: https://quillette.com/#/portal/support We made our website using Ghost, a powerful app for new-media creators to publish, share, and grow a business around their content. It comes with modern tools to build a website, publish content, send newsletters & offer paid subscriptions to members. Try it here: https://ghost.org/?via=claire91