d -- season. its design could be a game change. in a ware house north of san francisco. brain guard, a team of engineers led by dr. robert knight, smashed a football helmet again and again to see how it absorbs the impact. the rubber struts stretch and act as shock absorbers. no matter where the helmet is hit, the struts move. >> it mitigates the amount of force that goes to the inner shell that goes directly to your skull and brain. >> the twisting and turning of