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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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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Kevin Turner was a lead plaintiff in the class-action lawsuit against the NFL that was affirmed Monday. Turner died last month; he's seen here in a 2014 Senate hearing on the long-term effects of brain injuries. Charles Dharapak/AP hide caption

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Charles Dharapak/AP

Nigel Bradham of the Buffalo Bills celebrates a touchdown in the October game against Jacksonville Jaguars in London. Yahoo's online stream of the event was one of the NFL's digital tests. Alan Crowhurst/Getty Images hide caption

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Before Monday, no NFL official had publicly acknowledged a link between football and chronic traumatic encephalopathy. Here, members of the Denver Broncos are seen after one of their teammates suffered a concussion during a game in late 2014. Doug Pensinger/Getty Images hide caption

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In A First, NFL Executive Admits Football Is Linked To Brain Damage

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NFL Commissioner Roger Goodell holds a press conference on October 8, 2014 in New York City. Andrew Burton/Getty Images hide caption

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A Year On, Did NFL Anti-Domestic Violence Efforts Work?

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Delvin Breaux, during a game against the New York Giants in November 2015. Sean Gardner/Getty Images hide caption

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Even A Broken Neck Couldn't Bury His Dream

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Minnesota Vikings quarterback Teddy Bridgewater lies unconscious after sustaining a particularly nasty hit to the head during a game against the St. Louis Rams in 2015. The NFL reports there were 271 diagnosed concussions last year. Jeff Haynes/AP hide caption

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Jeff Haynes/AP