Whoops. It's November and I forgot to put in this review. I know I read it. Kindle says I have notes and highlights from August 7th!
Lots of great stuff in here. In particular - social norms are better motivators than monetary norms. For example - if you friend ask you to come help change his oil, you're more likely to help than if he asks "hey, I'll give you $5 if you come over and help me change my oil."