What are the determinants of a happy and fulfilling life?

This difficult question has been asked countless times throughout recorded history. The challenge has always been that happiness can be elusive regardless of how smart or successful you are. Many spiritual and philosophical leaders have all attempted to find an answer. Now, after a few thousand years we finally have an answer using Science. Pulling content from a variety of fields; including psychology, neuroscience, ACT, Behavioral Decision Theory, we are now able to offer a practical and tested recipe for leading a truly happy and fulfilled life.