Once shunned by NFL, 'disruptive' helmet inventor believes his time has come
The Guardian helmet cap touches down in Columbus
Concussions: Can cap keep football players' heads in game? – Orange County Register
Traumatic Brain Injury Isn't Just an NFL Problem
How Effective Are Football Helmets at Preventing Brain Injuries?
New football helmets could limit brain injuries
Tour the factory where Vicis makes high-tech helmets for NFL teams (Photos) - Puget Sound Business Journal
How helmet decals tell the story of Michigan and Ohio State
Technology can't save football players' brains
Detroit's Center for Neurological Studies Researching Concussions in Football - CNS - Center for Neurological Studies