Why are We Happy?

Moreese Bickham spent 37 years in prison for a crime he did not commit. He later got exonerated through DNA evidence. He commented: "I don't have one minute's regret. It was a glorious experience." Glorious experience?! How is that possible?

Daniel Gilbert, Professor of Psychology at Harvard University, tries to answer this and other similar questions in order to investigate on the secret of happiness.