Stanford running back Christian McCaffrey said he will not play in the Sun Bowl on Dec. 30, so he can focus on preparing for the NFL draft. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

Minnesota Vikings players bring down Washington wide receiver Art Monk during an NFL game in 1992. Monk was one of the lead plaintiffs in the $1 billion settlement with the NFL over brain injuries among former players. Doug Mills/AP hide caption

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Doug Mills/AP

An Oakland Raiders fan poses at the NFL Fan Fest inside the Chapultepec Park in Mexico City. The Oakland Raiders beat the Houston Texans, 27-20, at a sold-out Mexico City Azteca Stadium on Monday. Dario Lopez-Mills/AP hide caption

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Dario Lopez-Mills/AP

People pose for pictures during an NFL fan rally on Regent Street in London on Saturday. Tim Ireland/AP hide caption

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Tim Ireland/AP

Some Britons Are Learning To Love Football — The American Kind

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Colin Kaepernick, quarterback of the San Francisco 49ers, kneels during the national anthem before Thursday night's game in San Diego. Chris Carlson/AP hide caption

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Chris Carlson/AP

Kareem Abdul-Jabbar Calls Colin Kaepernick's Concerns 'Very Admirable'

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Quarterback Colin Kaepernick of the San Francisco 49ers throws a pass against the Green Bay Packers in the first half of their preseason football game on Friday in Santa Clara, California. Thearon W. Henderson/Getty Images hide caption

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Thearon W. Henderson/Getty Images

Pro Football Hall of Fame President David Baker (in blue jacket) inspects the turf at Tom Benson Hall of Fame Stadium after an NFL preseason football game between the Green Bay Packers and the Indianapolis Colts was canceled due to poor field conditions. Gene J. Puskar/AP hide caption

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Gene J. Puskar/AP

Dave Pear of the Oakland Raiders puts a stop to Larry Csonka of the Miami Dolphins after a 1-yard gain during fourth-quarter action on Oct. 9, 1979, in Oakland. The Raiders won 13-3. AP hide caption

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AP

What Is Football Doing To Us As A People?

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