How are H.S. football helmets tracked & managed? Investigation reveals lack of uniformity
This Flexible Football Helmet Absorbs Hits Like a Car Bumper
Study: We just don't know enough about youth concussions
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
3 in 4 Youth Football Players Have Ill-Fitting Helmets, Posing Concussion Risk
Helmet manufacturers, coaches try to protect players with advanced technology
The NFL concussion protocol cannot save football
FOOTBALL SAFETY FOR DUMMIES: Innovations to Reduce Effects of Concussi – 2nd Skull, Inc.
NFL hopes to reduce head injuries with helmet experiment
How Much Protection Do Football Helmets Offer?, Science
Study: No helmet brand can save football players from concussion risk - Los Angeles Times
New helmet design can deal with sports' twists and turns
New helmet design can deal with sports' twists and turns
Football helmets don't protect against concussion — and we're not sure what does