Earlier this fall, two squads of pint-size players clashed in the crisp air at a peewee football field in Southbridge, Mass. The boys on one team were much larger than the others, and within six plays, three of the smaller boys had been carried off with head injuries, one with his eyes rolling back in their sockets.

By the end of the game, a 52-0 rout, five boys on the losing team were receiving emergency medical care for concussions. Read More