The brain of former NFL star Junior Seau, who committed suicide last year, showed signs of the kind of neurodegenerative disease associated with repetitive head trauma. Elsa/Getty Images hide caption

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Letters: Standardized Tests For Teachers; Doppelgangers

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Baltimore Ravens linebacker Ray Lewis speaks at a news conference in New Orleans on Monday. The Ravens face the San Francisco 49ers in Super Bowl XLVII on Sunday. It will be Lewis' last game. Patrick Semansky/AP hide caption

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History Joins The 49ers In Opposing Ray Lewis

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An Argument For Living The Inner Life Without Your Own Thoughts

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Letters: Breast Pump Demand On The Rise, Concentration Camp Music

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A 'Permatemp' Economy: The Idea Of The Expendable Employee

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