I've written many times before about the need to have a positive outlook. My attitude was formed by the teachings of my friend Don Sandel, but I have also been heavily influenced by this book.
Mr. Achor provides easy-to-understand descriptions of the studies that have led to his conclusions, which essentially states that happiness is not something that comes from success, but it precedes success. In fact, happiness is needed for success.
After you enjoy this book, be sure to visit his TEDTalk. His style and storytelling methods will be sure to leave you happy.