How Sports Neurologists Protect Football Players' Brains
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
We Can Make Football Safer - Scientific American
Football Helmets Do Little to Protect Against Concussions: Study
Material for safer football helmets may reduce head injuries
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
How Effective Are Football Helmets at Preventing Brain Injuries?
Football helmet with liquid padding may prevent concussions
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Do helmets protect against concussion? - Queensland Brain Institute - University of Queensland
Future Football Helmets That Bend, Crumple and Twist by Design
Beyond the Helmet: Protecting the Brain of Your Athlete
How Helmets Have Evolved to Prevent Football Concussions - Chester County Hospital
Guardian Caps: Why some NFL players are wearing them in training camps