Could training without helmets reduce head injuries in football players?

The potentially devastating consequences of repeated head injuries in American football has become a point of public discussion following the recent release of the film “Concussion,” which hit theaters on Christmas Day. The film tells the story of how a young Nigerian forensic pathologist, Dr. Bennet Omalu, discovered a progressive brain disease called chronic traumatic encephalopathy (CTE) in the brain of a former NFL player, 50-year-old Mike Webster