In a live appearance at UCLA’s Royce Hall, New York Times best-selling author, happiness expert and Harvard-trained researcher Shawn Achor says that pleasure isn't the only thing that brings people happiness. How do you explain the joy felt during spiritually and emotionally challenging moments, such as when your legs are burning halfway through a marathon or when you cradle your 1-year-old in the middle of the night until she falls back to sleep? He offers a definition of happiness that encompasses all things that bring us deep, lasting joy. Shawn also explains how by making a single positive behavioral change, you can spark a powerful chain of happiness in your own life.