Albert Einstein shattered previous ideas about time, but left many pivotal questions unanswered: Does time have a beginning? An end? Why does it move in only one direction? Is it real, or something our minds impose on reality? Journalist John Hockenberry leads a distinguished panel, including renowned physicist Sir Roger Penrose, and prominent philosopher David Albert, as they explore the nature of time.  This event took place at the Gerald Lynch Theater at John Jay College. This is the third of five segments.