NFL NFL

San Francisco 49ers linebacker Chris Borland, center, during an NFL football game in Santa Clara, Calif. Borland announced that he will retire after just one season to protect himself from brain injuries. Marcio Jose Sanchez/AP hide caption

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Marcio Jose Sanchez/AP

'Borland Effect' A Fumble For Football? Deford Says It Will Pass

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San Francisco 49ers linebacker Chris Borland (50) is seen here in a game last year against the New York Giants. Borland, who had two interceptions in that game, has announced that he is retiring from the NFL after his rookie season. Chris Szagola/CSM/Landov hide caption

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Chris Szagola/CSM/Landov

Fans hold a "Los Angeles Rams" sign during a San Diego Chargers game against the St. Louis Rams last year. Both teams are part of proposals to build new NFL stadiums in the LA area. Donald Miralle/Getty Images hide caption

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Donald Miralle/Getty Images

Leland Melvin with his dogs, Jake and Scout. "I snuck them into NASA to get this picture," Melvin says. Courtesy of Leland Melvin hide caption

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Courtesy of Leland Melvin

From Touchdowns To Takeoff: Engineer-Athlete Soared To Space

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Malcolm Butler (right) of the New England Patriots intercepts a pass intended for Ricardo Lockette of the Seattle Seahawks late in the fourth quarter of Super Bowl XLIX on Sunday. Timothy A. Clary/AFP/Getty Images hide caption

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Timothy A. Clary/AFP/Getty Images

Football rules, uniforms, helmets and protective gear have changed a lot over the years. Keystone-France/Gamma-Keystone via Getty Images hide caption

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Keystone-France/Gamma-Keystone via Getty Images

Why Do We Love Football So Much? Theater Tackles Tough Questions

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Bill Parcells has been coach to the Dallas Cowboys, the New York Giants, the New England Patriots and the New York Jets. Robert B. Stanton/Getty Images hide caption

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Robert B. Stanton/Getty Images

Should Ray Rice Get A Second Chance? 'Maybe,' Parcells Says

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Rafael Nadal (right) shakes hands with Tim Smyczek after winning a match at the Australian Open on Jan. 21. Rob Griffith/AP hide caption

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Rob Griffith/AP

The Tennis Court Offers A Good Lesson For The NFL

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Tom Brady of the New England Patriots hands the ball off to LeGarrette Blount during the AFC Championship Game. The Patriots are being investigated because of game balls that were improperly inflated. Elsa/Getty Images hide caption

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New England Patriots head coach Bill Belichick, seen here on Jan. 18, says he "had no knowledge" about the controversy over deflated footballs "until Monday morning." Elise Amendola/AP hide caption

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Elise Amendola/AP

Panelist Nahshon Ellerbe, a star running back at Trinity Christian Academy in Addison, Texas, warms up before a game against Midland Christian. Jeffrey McWhorter/Trinity Christian Academy hide caption

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Jeffrey McWhorter/Trinity Christian Academy

A deflated football would have been easier for New England Patriots quarterback Tom Brady (12) to grip in Sunday's rain. Charles Krupa/AP hide caption

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Charles Krupa/AP

Scientists Say The NFL's 'Deflate-Gate' Isn't All Hot Air

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Questions over out-of-regulation footballs have come up after the New England Patriots won the AFC Championship Game Sunday. Running back LeGarrette Blount ran for 148 yards and three touchdowns in the Patriots' 45-7 win over the Indianapolis Colts. Elsa/Getty Images hide caption

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Elsa/Getty Images