Dallas-Fort Worth high school helmets and concussions
Tracking how high school football helmets are inspected and refurbished each year
The Fruitless Search for a 'Concussion-Proof' Football Helmet - The Atlantic
NFL Looks to Helmet Technology to Combat Concussions
Virginia Tech research provides much-needed data, system for rating sports equipment - ESPN
Football helmet with liquid padding may prevent concussions
Concussion Prevention: Senator Wants Crackdown on Product Claims
New Football Helmet Warning Label
Flexible NFL helmet aims to reduce head injuries
The Football Helmet Of The Future
Riddell launches Axiom, latest helmet to combat concussions
Report warned Riddell that no helmet could prevent concussions but NFL's helmet-maker marketed one as such anyway - ESPN