Daniel Kahneman and Amos Tversky met in war-torn 1960s Israel. Both were gifted young psychology professors: Kahneman a rootless son of holocaust survivors who saw the world as a problem to be solved; Tversky a voluble, instinctual blur of energy. Over the next forty years, their friendship found expression in an extraordinary intellectual collaboration: one whose impact has been so profound and wide-reaching that today it affects the lives of us all. Showing the ways in which the human mind errs, systematically, when forced to make judgments about uncertain situations, Kahneman and Tversky shed new light on how we make decisions. Their ideas revolutionized everything from Big Data to medicine, from sport to high finance, from how we are governed to how we spend. In The Undoing Project, Michael Lewis tells the story of how their unlikely friendship became one of the greatest partnerships in science until, tragically, it started to unravel. The Undoing Project shows how this remarkable partnership helped shape the world in which we now live - and may well have changed, for good, humankind's view of its own mind.