Chris Borland, a second year linebacker for the San Francisco 49ers, is retiring after his successful rookie season. He tells ESPN that the money, fame, and fun of pro football “isn’t worth the risk” of long-term head injury: Borland becomes the most prominent NFL player to leave the game in his prime because of concerns about brain injuries. More than 70 former players have been diagnosed with progressive neurological disease after their deaths, and numerous studies have shown connections between... Read more