. >> professor dumis is trying to make the game safer.reate safer helmets. >> front, side, back, top impacts. for every test we multiply that by how many times the players sees that in a year. everything comes together, giving you a star rating. the helmets absorb energy better, lower acceleration, lowering risk. >> you have what looks like a helmet canon. what is this modelling different from the other test? >> we are going away from the single linear drop. we know every head impact has linear rotation. you have energy input. this task - the head can rotate and slide away. >> three, two, one, go. >> remember this 100 g hit? professor dumis has a 5-star helmet reducing it bias much as 50%, that's because the shell riskful. >> there are helmets that reduce your risk. like 5-star cars reduce your risk of dying in a car crash. >> as for blake lawrence, the risks of the game that he had, decision. >> our head coach said, "your concussions are happening too easily. that summer, before my junior ner at nebraska, i told myself and my family and