NFL hopes to reduce head injuries with helmet experiment
NFL players don Guardian Caps, designed to protect from concussion
Teaching Youth Football Coaches About Player Safety Reduces Injuries
Football helmets don't protect against concussion — and we're not sure what does
Dallas Startup Touts a Headgear Invention That Could Reduce Concussions in Contact Sports » Dallas Innovates
Issues with helmet outfitters causing a panic among coaches - Footballscoop
If You Can Touch It, You Can Catch It
NFL hopes to reduce head injuries with helmet experiment – KGET 17
Rush Propst offers no comment as Valdosta appeals penalties
What's with the padded helmet caps the 49ers are wearing at training camp?
Football helmets are creating more problems than they solve
This Helmet Will Save Football. Actually, Probably Not. - The New York Times