How to keep your delicate brain safe - BBC Future
Safety first: Lopers to wear padded caps in practice to prevent concussions
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This Helmet Will Save Football. Actually, Probably Not. - The New York Times
With Eye on Concussions, NFL Adopts New Rule on Helmet Hits
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X2E+ Youth Xenith Football Helmets, Shoulder Pads & Facemasks
New helmet design can deal with sports' twists and turns
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In finding right fit, high school football players have option of using their own helmet, Prince William
The Extra Yard: The Ins and Outs of an American Football Helmet - Stories
Brain tissue strains vary with head impact location: A possible explanation for increased concussion risk in struck versus striking football players - ScienceDirect
Football helmet - Wikipedia