The psychologist Daniel Kahneman \u2014 a Nobel laureate and the author of \u201cThinking, Fast and Slow\u201d \u2014 recently died at age 90. Along with his collaborator Amos Tversky, he changed how we all think about decision-making. The journalist Michael Lewis told the Kahneman-Tversky story in a 2016 book called "The Undoing Project." In this episode, Lewis explains why they had such a profound influence.