More than a dozen present and former NFL players have pledged to donate their brains for research on concussion, the Associated Press reported Monday. http://www.latimes.com/sports/football/nfl/wire/sns-ap-fbn-nfl-concussions-players-brains,0,1348935.storyThe players, who include Hall of Fame member Mike Haynes and Chicago linebacker Hunter Hillenmeyer, will donate their brains and spinal cord tissue after their deaths to the Center for the ...