NFL hopes to reduce head injuries with helmet experiment
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Concussions are a huge issue in football. Outer-padded helmets could go a long way toward solving it. - ESPN
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Helmets don't protect the back of the head as well as they should, researcher finds
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Should Football Players Train Without Helmets?
NFL's safest helmet ever may not be enough to stop concussions
Should Football Players Train Without Helmets?
Repeated Head Hits, Not Just Concussions, May Lead To A Type Of Chronic Brain Damage
NFL hopes to reduce head injuries with helmet experiment