Michael Lewis's The Undoing Project is a book that explores the careers and friendship of two revolutionary psychologists, Daniel Kahneman and Amos Tversky. Lewis examines their collaboration, which challenged traditional notions of rational behavior and led to the development of Prospect Theory, a model that more accurately explains how people make decisions under uncertainty. The book explores the duo's journey, highlighting their individual backgrounds, the challenges they faced, and their significant contributions to behavioral economics and psychology. Through these stories, Lewis reveals how Kahneman and Tversky revolutionized our understanding of human decision-making by demonstrating the limits of rationality and highlighting the role of cognitive biases in shaping our judgments.