New helmet design can deal with sports' twists and turns
Why Marine City Cardinal Mooney football spent $35,000 on new helmets
NFL hopes to reduce head injuries with helmet experiment
Football helmet with liquid padding may prevent concussions
NFL's new quarterback specific helmet design – United Brain Association
New Helmet Technology Reduces Brain Injuries, Dr. John Lloyd
Everything you need to know about the NFL's helmet guidelines and restrictions - Canal Street Chronicles
Iowa Hawkeyes are on cutting edge of player safety
How to keep your delicate brain safe - BBC Future