Most contact sports today require players to wear a helmet. Cyclists and skiers wear them to protect from serious injury if they fall. While helmet technology has come a long way, there is still a push to make sure that they are providing as much protection as possible. Dr. Stefan Duma is a professor of engineering and the founding director of the Virginia Tech-Wake Forest Center for Injury Biomechanics. Duma joins us to discuss his research and the STAR safety rating system given to hockey and