In his trailblazing Harvard courses, his internationally bestselling books, as well as his lectures and videos, positive psychologist Tal Ben-Shahar has shared his wisdom on finding fulfillment with people around the world. But even a happiness expert needs a sympathetic ear now and then. Tal found his--not in a fellow psychologist or guru, but in his longtime Israeli neighborhood barber, Avi, who (along with cutting hair) dispenses wisdom beyond...