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Health-misinformation researcher and science communicator Timothy Caulfield returns to discuss his new book THE CERTAINTY ILLUSION, why being too certain about anything makes us vulnerable to misinformation, how intellectual humility can help protect us, why science is sometimes “full of shit” and how to be a critical consumer of it, and more. Behind the paywall, we get into why it’s so hard for public figures to show intellectual humility, whether being smart makes people less intellectually humble and more vulnerable to misinformation, the role of narcissism in misinformation belief, the Dunning-Kruger effect, and why so many researchers lie about their work. Plus, Christy asks Tim for advice on how to navigate an alternative-medicine recommendation for IVF, and whether refusing to do it is a hill she wants to die on.

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Timothy Caulfield is a Professor in the Faculty of Law and the School of Public Health, and Research Director of the Health Law Institute at the University of Alberta. He was the Canada Research Chair in Health Law and Policy for over 20 years (2002 - 2023). His interdisciplinary research on topics like stem cells, genetics, research ethics, the public representations of science, and public health policy has allowed him to publish almost 400 academic articles. He has won numerous academic, science communication, and writing awards, and is a Member of the Order Canada and a Fellow of the Royal Society of Canada, the Canadian Academy of Health Sciences, and the Committee for Skeptical Inquiry. He contributes frequently to the popular press and is the author of national bestsellers: The Cure for Everything: Untangling the Twisted Messages about Health, Fitness and Happiness (Penguin 2012) and Is Gwyneth Paltrow Wrong About Everything?: When Celebrity Culture and Science Clash (Penguin 2015), and Relax, Dammit!: A User’s Guide to the Age of Anxiety (Penguin Random House, 2020). His most recent book is The Certainty Illusion: What You Don’t Know and Why It Matters (Penguin Random House, 2025; Bookshop affiliate link). Caulfield is also the co-founder of the science engagement initiative #ScienceUpFirst and has written, hosted and produced documentaries, including the award-winning TV show, A User’s Guide to Cheating Death, which has been shown in over 60 countries, including streaming on Netflix in North America.

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