A wonderful exploration of willpower. The book reads easily and includes many references to research performed by the authors and many other scientists. It opens with the history of the discovery of willpower and that willpower is a limited but renewable resource. Next it dives into how humans can survive this depletion of willpower and most importantly setup conditions to remove the need to use willpower in the first place. Most encouraging the book concludes with a review of why willpower matters and the various techniques to strengthen it.