The concussion crisis in football is getting harder and harder to ignore. The sport is trying to change the rules to protect players, but danger could be too deep in its DNA.
Written by Joseph Stromberg.
Produced by Joss Fong, Joe Posner, Alex Hawley
Images courtesy of Getty Images. Additional footage from: "League of Denial" (PBS FRONTLINE), Casualties of the Gridiron" (GQ Magazine), "Brett Favre on NFL, Concussions" (NBC Today show), Fight Films Guy, ClassicBoxingSociety, FootzStomp, Michael Boothe, James Taylor