NFL hopes to reduce head injuries with helmet experiment
It's A Surprise That Football Helmets Don't Actually Protect Against Concussions - Pledge Sports
Concussions are a huge issue in football. Outer-padded helmets could go a long way toward solving it. - ESPN
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
How a game-changing helmet design could prevent concussions - WINK News
The Coat of Arms Discussion: How are Serious Concussion Issues Changing Football?
Can high-tech helmets solve football's thorniest problem?
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NFL, NFLPA approve new helmet that quarterbacks can wear to reduce concussions
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