Harvard psychologist and best-selling author Dr. Daniel Gilbert (&NFi;Stumbling on Happiness&NFi_;) hosts this three-part PBS series that explores the range of human emotions and how we can strive to become more positive in our day-to-day lives. The program examines the biological basis of happiness, the role of relationships and the ways in which we can cope with negative emotions. Celebrities such as Chevy Chase and Larry David offer additional insights. watch