Kevin Turner was a lead plaintiff in the class-action lawsuit against the NFL that was affirmed Monday. Turner died last month; he's seen here in a 2014 Senate hearing on the long-term effects of brain injuries. Charles Dharapak/AP hide caption

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Dr. Bennet Omalu speaks on stage during the 2015 Health Hero Awards hosted by WebMD on Nov. 5 in New York City. Bryan Bedder/Getty Images hide caption

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Doctor Behind 'Concussion' Wanted To 'Enhance The Lives' Of Football Players
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High school athlete Graham Hill, number 50, suffered a concussion in 2013 while playing football at Trinity Christian Academy in Addison, Texas. Courtesy of Jeffrey McWhorter hide caption

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High Schools Seek A Safer Path Back From Concussion
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Making and taking a hit chest to chest, instead of skull to skull, is easier to remember if you're not wearing a helmet, say University of New Hampshire Wildcat football players. Jack Rodolico/New Hampshire Public Radio hide caption

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Football Players Drill Without Helmets To Curb Concussions
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Junior Seau sustained many concussions during his career and was suffering from a degenerative brain disease when he killed himself in May 2012. Otto Greule Jr./Getty Images hide caption

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