This week, Mark and Margaret speak with Emmy Award-winning filmmaker John Hoffman, Vice President of HBO Documentary Films and Executive Producer of the "Weight of the Nation", a four-part documentary series produced in conjunction with the Institute of Medicine and the National Institute of Health, that explores the growing epidemic of obesity in this country. Mr. Hoffman speaks about HBO's commitment to using the documentary platform to publicize the causes of obesity, and engage communities in a dialogue about actions and solutions.