NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Concussion research: VR goggles and reinventing the helmet
Doctors urge awareness of concussions during school sports season
Headpulses Could Help Identify Sports Concussions
Dallas-Fort Worth high school helmets and concussions
Inadequate Helmet Fit Increases Concussion Severity In High School Football Players – Microsite
Football helmet with liquid padding may prevent concussions
How are H.S. football helmets tracked & managed? Investigation reveals lack of uniformity
ER Visits for Concussions Spike as Damage Becomes Clear