problems in a minority of players. >> larry: could a problem be in the helmet. >> helmet design is important, but in my opinion, helmets aren't the whole answer. i think we need to take the head impact, the motion of the brain inside the skull out of the game. >> larry: the nfl is fearing it may shorten life, can it? >> we have autopsied quite a few athletes who have had a shortened life because of this syndrome. i support football, i think it's america's greatest sport. we want to make it safer, in certain cases there have been long-term detrimental affects of concussions.