How do football helmets help prevent concussions? - Quora
A Helmet Inspired By Woodpeckers Could Save Football Players From Concussions
New football helmets could limit brain injuries
How to keep your delicate brain safe - BBC Future
Beyond the Helmet: Protecting the Brain of Your Athlete
Vicis reveals price, more details about high-tech football helmet that reduces brain trauma – GeekWire
Padded helmet cover shows little protection for football players - Scope
New helmet design can deal with sports' twists and turns
The Fruitless Search for a 'Concussion-Proof' Football Helmet - The Atlantic