Hear why this doctor thinks so many people are unhappy CNN 0 111 03.24 03:30 https://www.youtube.com/watch?v=4hGTUVcpBc0 + 14 https://www.youtube.com/feeds/videos.xml?channel_id=UCupvZG-5ko_eiXAup… + 14 Hear why this doctor thinks so many people are unhappy