'There are geniuses who work on their own. Together, we are exceptional.' 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, instinctive blur of energy. In this book, Michael Lewis tells the story of how their unlikely friendship became one of the greatest partnerships in science - until, tragically, it started to unravel.