The Football Helmet Just Got the Biggest Redesign Since the 1960s
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Helmet safety: Inside the complicated equipment industry - Sports
Wall Street Journal: Cardinals' Kingsbury might be next great coach
Helmet-to-Helmet Hits in N.F.L. Haven't Diminished, but Penalty
NFL hopes to reduce head injuries with helmet experiment
What happened to Vicis: Inside the collapse of the high-tech
The Safest Football Helmet Is Not Yet a Hit in the NFL - WSJ
New Football Helmet Could Save the Sport
The Safest Football Helmet Is Not Yet a Hit in the NFL - WSJ
We Know Football Is Dangerous. So Why Are We Still Letting Our
Safety (gridiron football score) - Wikipedia
New Smart Helmet Could Spot Concussions in Real Time