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(THE CONVERSATION) Editor’s note: The following is a roundup of archival stories about concussions, including advice on how to recognize symptoms and explanations of why they can be so dangerous to children.

A study published July 25 based on examinations of brains of deceased NFL players reported disturbing news about the prevalence of concussions. Of 111 brains examined, all but one were found to have chronic traumatic encephalopathy, or CTE, the degenerative brain disease caused...