Why Is It So Hard to Stop Sports Concussions?
NFL Awards $491,999 to CU Denver, Impressio, Inc. for Helmet Safety - CU Denver News
Concussions a concern heading into football season
Hoosier Helmets: Rule changes, new designs brought measure of safety to game
$200 Q-Collar is designed to prevent athlete brain injuries
Padded helmet cover shows little protection for football players - Scope
Riddell launches Axiom, latest helmet to combat concussions
Football helmet with liquid padding may prevent concussions
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN