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Two small clinical studies show brain changes among young football players with a history of concussion and exposure to high-impact hits.

Jason Socrates Bardi, Editor

Scientific advances in the way doctors diagnose and treat concussions.

Jason Socrates Bardi, Editor

The goals of a major push for football helmet safety should bring improvements, but the overall results remain unpredictable.

Chris Gorski, Editor

How new and improved sports protection equipment could help in concussion prevention.

Jason Socrates Bardi, Editor

Concussions are "functional" injuries -- not something seen in a brain scan or a blood draw but in myriad symptoms arising from altered circuitry in the brain.

Jason Socrates Bardi, Editor

New protocols, more societal recognition and advances in understanding and managing concussion have improved safety at all levels of sports.

Jason Socrates Bardi, Editor

The vast majority of traumatic brain injuries are concussions. Researchers talk about the problem of these head injuries in sports.

Jason Socrates Bardi, Editor

Ongoing studies try to quantify the risks and benefits of contact sports.

Rebecca Boyle, Contributor

The 100th Indianapolis 500 will continue the tradition of testing tomorrow's commuter technology on the track.

Peter Gwynne, Contributor

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