Positive psychology is an emerging science that investigates the qualities, attitudes, and practices that enable people to thrive and be happy. So what does this research reveal about human happiness? Are some of us just born with happier dispositions than others? How (if at all) do health, wealth, family relations, and community ties affect our happiness? Do happy people have a better or worse grip on reality than unhappy people? And is happiness something really worth pursuing? John and Ken get happy (scientifically) with Emiliana Simon-Thomas, Science Director of the Greater Good Science Center at UC Berkeley.