In Race to Develop Safer Football Helmets, Many Questions Remain - The New York Times
Better helmets, sensored mouth guards part of effort to make football safer
3 in 4 Youth Football Players Have Ill-Fitting Helmets, Posing Concussion Risk
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
New Football Helmet Could Save the Sport
Padded helmet cover shows little protection for football players - Scope
Football's Concussion Crisis Is Awash With Pseudoscience
Can a Better Football Helmet Save Your Kid's Brain? - Washingtonian
Helmet technology being used around Michigan to help detect concussions
Guardian Caps Guardian Sports
Teen's woodpecker-inspired system aims to reduce football concussions
Football helmet design can lower concussion risk, study finds
NYIT study: Padded helmets provide scant protection from concussions - Newsday
The Fruitless Search for a 'Concussion-Proof' Football Helmet - The Atlantic
Football helmet with liquid padding may prevent concussions