NFL testing safer helmets
Op-Ed: 5 steps to protect football players' brains and keep the sport alive - Los Angeles Times
The NFL's taunting rules solidify how old men are ruining football
Gallaudet University debuts 5G-connected helmet : NPR
American football - Wikipedia
NFL, NFLPA to ban use of 10 helmet models
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture
Tom Brady's longtime helmet type banned by NFL
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture