They all died young. Most played football. Only a few came close to reaching the pros. But like hundreds of deceased N.F.L. players — including the Pro Football Hall of Famers Mike Webster, Junior Seau and Ken Stabler — they, too, had C.T.E., the degenerative brain disease linked to repeated hits to the head. For now, C.T.E. can be positively diagnosed only posthumously. The brains of 152 young athletes, both men and women who died before turning 30, were studied by researchers at Boston University. #cte #football #highschoolfootball #collegefootball #chronictraumaticencephalopathy Video by Kassie Bracken, John Branch, Ben Laffin, Rebecca Lieberman and Joe Ward/The New York Times