Michael Lewis tells the story of an unlikely scientific friendship that changed how we think about thinking. The Undoing Project follows psychologists Daniel Kahneman and Amos Tversky as they uncover the systematic ways our minds err—using shortcuts, or heuristics, that often mislead us. Their research dismantled the myth of the rational decision-maker and gave rise to behavioural economics.

Lewis weaves their discoveries—biases like representativeness, anchoring, and loss aversion—into vivid stories from medicine, sports, and finance, showing how even experts are swayed by framing and intuition. But at its heart, this is a portrait of collaboration: Kahneman’s empathy paired with Tversky’s brilliance, producing insights neither could reach alone.

The Undoing Project reminds us that progress often begins with questioning our own certainty—and that understanding our cognitive flaws is the first step toward making wiser choices in an unpredictable world.