In Brownsville, offensive linemen for Pace High School's football team hit a sled during a Sept. 11 practice.
In Brownsville, offensive linemen for Pace High School's football team hit a sled during a Sept. 11 practice. Reynaldo Leal for The Texas Tribune

Concern about football-related head injuries in pro sports has prompted Texas to launch the country’s largest effort to track brain injuries among student athletes. (USA Today)

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