Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
New helmet design can deal with sports' twists and turns
Can Science Solve Football's Concussion Crisis?
Football safety concerns come to a head – Orange County Register
This Helmet is Called “Zero1”— Could it be a TEN? - Mid-Atlantic Concussion Alliance
Football Helmets Do Little to Protect Against Concussions: Study
Helmets protect athletes' skulls. Will the NFL use neuroscience to protect their brains?
CBS report: Doctors speak out against how concussions are portrayed in media
NFL, NFLPA approve concussion-reducing helmet for quarterbacks
Helmets don't eliminate concussions. It's time for the NFL to ditch them, NFL
A Look Back at the Super Bowl, and Three Reforms That Are Needed Now - The New York Times
NFL Concussion Prevention: Could New Helmet Save Football?, News, Scores, Highlights, Stats, and Rumors
CTE found in 345 of 376 former NFL players studied