Making and taking a hit chest to chest, instead of skull to skull, is easier to remember if you're not wearing a helmet, say University of New Hampshire Wildcat football players. Jack Rodolico/New Hampshire Public Radio hide caption

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FIFA President Joseph Blatter is flanked by Russian Deputy Prime Minister Igor Shuvalov (right) and Qatari Emir Sheikh Hamad bin Khalifa Al-Thani on Dec. 2, 2010, in Zurich, Switzerland, after the announcement that Russia will host the 2018 World Cup and Qatar in 2022. Michael Probst/AP hide caption

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Go Big Green! Dartmouth is testing the VGo robot to help diagnose concussions when neurologists aren't at the game. Mark Washburn/Courtesy of Dartmouth-Hitchcock hide caption

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Punter Ray Guy, No. 8 of the Los Angeles Raiders, kicks the ball past the Denver Broncos' rush during a 1985 game. Guy has officially been inducted into the Pro Football Hall of Fame. George Rose/Getty Images hide caption

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Portugal's Cristiano Ronaldo takes a water break during the 2014 World Cup soccer match between Portugal and the U.S. in Manaus, Brazil, on June 22. Siphiwe Sibeko/Reuters/Landov hide caption

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Ryan Giggs, who is filling in as manager of Manchester United, one of the world's most valuable and most popular soccer clubs. He's vowing to make fans proud of the team again. Alex Livesey/Getty Images hide caption

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Denver Broncos quarterback Peyton Manning during Sunday's Super Bowl. Some players on the Seattle Seahawks say they studied his hand signals. That helped them shut down the Broncos defense, they say. Kevin C. Cox/Getty Images hide caption

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The current record holder for loudest crowd in history are the fans of the Seattle Seahawks, who cheered so loud that they induced a mini-earthquake. But that level of noise can permanently damage fans' hearing. Scott Eklund/AP hide caption

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The winning catch: Wide receiver Kelvin Benjamin of the Florida State Seminoles catches the 2-yard pass for a touchdown that put his team ahead for good with just 13 seconds left in the game. Harry How/Getty Images hide caption

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Look, But Don't Touch, Part I: Some players are superstitious and don't want to touch a trophy until they win it. Florida State defensive back Jonathan Akanbi poses with the NCAA's Coaches' Trophy, which goes to the winner of Monday night's game. Chris Carlson/AP hide caption

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Indianapolis Colts quarterback Andrew Luck dives over the goal line in the fourth quarter of his team's 45-44 victory over the Kansas City Chiefs. David Eulitt /MCT/Landov hide caption

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He's out: Washington Redskins head coach Mike Shanahan on Sunday during the team's loss to the New York Giants. He was fired on Monday. Jeff Zelevansky/Getty Images hide caption

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