* An alarming study, recently released, suggests that C.T.E. is not just lurking at the margins, an outlier outcome for the most risk-prone players — in fact, at least 25 percent of N.F.L. players might expect to have it. Researchers think the real figures are much higher. CTE is thought to be caused by repeated collisions with the head. Do you think the time will come when high school tackle football will be abolished?

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