"PROFESSIONAL FOOTBALL PLAYERS DO NOT SUSTAIN FREQUENT REPETITIVE BLOWS TO THE BRAIN ON A REGULAR BASIS."So concluded the National Football League in a December 2005 scientific paper on concussions in America's most popular sport. That judgment, implausible even to a casual fan, also contradicted the opinion of a growing cadre of neuroscientists who worked in vain to convince the NFL that it was facing a deadly new scourge: A chronic brain disease that was driving an alarming number of players -- including some of the all-time greats -- to madness.League of Denialreveals how the NFL, over a period of nearly two decades, sought to cover up and deny mounting evidence of the connection between football and brain damage.Comprehensively, and for the first time, award-winning ESPN investigative reporters Mark Fainaru-Wada and Steve Fainaru tell the story of a public health crisis that emerged from the playing fields of our 21st century pastime. Everyone...