11. Richard St. John
St. John spent years conducting over 500 interviews of successful people and condensed their answers down to eight secrets of success. Interestingly enough, having fun is one of them.

12. Dan Ariely
As grown-ups we have learned to make rational decisions on everything from which car to purchase to our choice of partner. But have we really?  Behavioral economist Dan Ariely argues that the decisions we make aren’t as based in rationality as we think.