Brains of former football players showed how common traumatic brain injuries might be

Signs of degenerative brain disease are also found in former high school and college athletes

football players colliding

HARD KNOCKS  By studying the brains of former football players, researchers are finding clues about how a neurodegenerative disease called chronic traumatic encephalopathy, or CTE, progresses, with the hopes of one day preventing it.

Tom Pennington/Getty Images

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