A Helmet Shortage Is Hitting High School Football Across the Country - The New York Times
New Football Helmet Could Save the Sport
Helmet safety: Inside the complicated equipment industry - Sports Illustrated
NFL players don Guardian Caps, designed to protect from concussion
In finding right fit, high school football players have option of using their own helmet, Prince William
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
How to keep your delicate brain safe - BBC Future
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Football Players Drill Without Helmets To Curb Concussions : Shots - Health News : NPR
Football's Concussion Crisis Is Awash With Pseudoscience
At Last, Football Faces Concussion Problems Head-On : NPR
New tests for helmets proposed in concussion fight