Hour 1: As football season takes off this fall, many parents and coaches are concerned about brain injuries and concussions – and it has become a big issue in the NFL, too. This hour we’ll preview tomorrow’s PBS FRONTLINE season premiere “League of Denial” with ESPN investigative reporter Steve Fainaru. His new book on the subject, League of Denial: The NFL, Concussions and the Battle for Truth (Crown Archetype, 2013), is also out tomorrow.