NFL stars could wear motorcycle-style helmets as the sport searches for new ways to protect players from head injury and concussion: 'There are big strides we can still take'
Helmet Innovation: More and Better Choices, Fewer Concussions
See the new football helmet that got funding from the NFL
League of Denial: The NFL, Concussions and the Battle for Truth: 9780770437541: Fainaru-Wada, Mark, Fainaru, Steve: Books
Dig Deeper: Investigating the NFL's Concussion Crisis
Flexible NFL helmet aims to reduce head injuries
NFL: Concussions dropped by more than 50% among players who wore Guardian Caps during summer
The science behind safety: West Orange High orders new Riddell's Axiom helmets
Tackling the Concussion Issue: Can the NFL Protect Both Its Players and Its Product? - Knowledge at Wharton
Explainer: Tua Tagovailoa, fencing response and NFL protocol
New football helmets hope to make a dent in reducing concussions
This Helmet Will Save Football. Actually, Probably Not. - The New York Times