'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 breathtaking new 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. Their ideas, shows Lewis, helped shape our world - revolutionising everything from Big Data to medicine, money to sport - and changed humankind's view of its own mind.