Hall of Fame quarterback Dan Marino is among the latest group of football players to file a concussion-related lawsuit against the National Football League. The 52-year-old former Miami Dolphins quarterback is one of 15 former players who filed a lawsuit in federal court in Philadelphia last week. Marino and the other 14 plaintiffs join more than 4,800 others who have alleged the NFL misled players about the long-term dangers of concussions. The NFL has denied those claims. More...