Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
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Modern football helmets no better than 'leatherheads' at protecting against concussions, study finds
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Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
Football's Concussion Crisis Is Awash With Pseudoscience
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Wes Welker says concussions aren't slowing him down - The Boston Globe
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
New Stanford-Developed High-Tech Helmets Could Protect Football Players From Debilitating Concussions