Why don't football players show more bruises given the incredible amount of hits that they take? - Quora
Star football player's concussion a reminder that 'these things are serious,' sports medicine doctor says, MUSC
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NFL hopes to reduce head injuries with helmet experiment
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2nd Skull, Inc and Guardian Sports announce partnership focused on athlete head protection.
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NFL Grants $100K To Local Company For Concussion Protection Technology
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Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
New helmet standard to address concussion prevention