For book forty nine of 2015, I enjoyed the book Willpower: Rediscovering the Greatest Human Strength.
This was a great book and I was fascinated by nearly every page. I think the biggest thing I enjoyed out of the book Willpower was the relationship between decision making and willpower. Specifically, Willpower covers the interrelation between the accumulation of challenging tasks and how they may be impacted by the proximity to other challenging tasks (close proximity is bad, especially if they are numerous and build over something like a challenging week).
This was an exceptional read and is on my must enjoy list!