I was reading Martin Seligman's new book, "Flourish". I had to say it was more a hodgepodge of what's happening in positive psychology than a well thought book. (The real interesting thing in that book is to see the "positive psychology" field was built. It's like building an empire.) Though he had revised the "positive psychology" to be about "well-being" instead of "authentic happiness", this old video pretty much summarizes most of it.