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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. Further reading: PBS' great coverage of this issue: http://www.pbs.org/wgbh/pages/frontline/league-of-denial/ Boston University's CTE Center: http://www.bu.edu/cte/about/what-is-cte/ League of Denial Q&A (sbnation) http://www.sbnation.com/nfl/2013/10/9/4817818/league-of-denial-nfl-concussion-crisis-authors-interview-pbs-frontline "Does Football have a future?" (The New Yorker) http://www.newyorker.com/magazine/2011/01/31/does-football-have-a-future Written by Joseph Stromberg Produced by Joss Fong, Joe Posner, Alex Hawley Images courtesy of Getty Images Video footage from: "League of Denial: The NFL's Concussion Crisis" (PBS FRONTLINE) http://video.pbs.org/video/2365093675/ "Casualties of the Gridiron" (GQ Magazine) https://www.youtube.com/watch?v=H203KkqimqI&list=PL0hKMB1-xkc-T3mmvkes9q1Y25otfMfTX#t=0 "Brett Favre on NFL, Concussions" (NBC Today show) http://www.today.com/news/brett-favre-nfl-concussions-toll-has-got-be-pretty-high-2D11603374 Fight Films Guy https://www.youtube.com/watch?v=XZc-5HBaWsk ClassicBoxingSociety https://www.youtube.com/watch?v=1FEjWjB6UJc&list=UUJW2lNFwuVGIQkLcjY5vFiA FootzStomp https://www.youtube.com/watch?v=L0_rXN5itlg Michael Boothe https://www.youtube.com/watch?v=AB6oo7eQT20 James Taylor https://www.youtube.com/watch?v=9Qi9IdLSw9Q --- Subscribe to our channel! http://www.youtube.com/subscription_center?add_user=voxdotcom Vox.com is news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out http://www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Follow Vox on Twitter: https://twitter.com/voxdotcom Or on Facebook: https://www.facebook.com/Vox