Concussion

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Football Hall of Famer Mike Webster of the Pittsburg Steelers won four Super Bowl rings throughout his 17-year NFL career. He retired in 1990 and was enshrined seven years later, but his life would go downhill from there: Five years later, he was dead from a heart attack. The sad story would have stopped there if it weren’t for a junior pathologist in the Allegheny coroner’s office whose relentless search to know why led to the discovery of chronic traumatic encephalopathy, or CTE. As more cases came to his attention, this Nigerian-born doctor took on one of the most powerful institutions in the world—the NFL.

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