Remember the old days of professional football? A player who acted a little woozy after taking a shot to the head was said to have “had his bell rung.” He stayed on the sidelines for a while and then went back into the game.
No longer. From the National Football League on down, football teams treat head injuries seriously. Concussions now often sideline players for a week or more. They have ended the careers of some high-profile players. Evidence is mounting about the connection between multiple concussions and neurological diseases such as Alzheimer’s and Parkinson’s, multiple sclerosis and even the risk
