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NFL, NFLPA approve concussion-reducing helmet for quarterbacks
Next gen hard hats give better protection against head injury : Shots - Health News : NPR
Driving Innovation in Helmet Performance: Better Choices for Players
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Kickoff rule tied to fewer concussions in new research
NFL at 100: Helmets go high tech in quest for player safety
Built By Data: NFL Helmet Innovation
Football helmets have improved but are far from 'concussion proof' – San Bernardino Sun
Racing innovator Bill Simpson tackles football concussions with new helmet
Football Concussions: Prevention, Diagnosis & Recovery
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
The Kali Invader 2.0 Helmet
Gridiron Game Changer - San Diego Business Journal
Helmet Innovation: More and Better Choices, Fewer Concussions