CTE is a degenerative brain disease confirmable only after death, and often caused by repeated blows to the head that knock the brain against the skull. The cumulative impacts of hundreds of supposedly minor blows can have the cumulative effect of many concussions. The New York Times recently reported Stanford researchers’ data showing “that one college offensive lineman sustained 62 of these hits in a single game. Each one came with an average force on the player’s head equivalent to what you would see if he had driven his car into a brick wall at 30 mph.” Boston University researchers...