Tony Stewart is introduced before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Chuck Burton)
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Carl Edwards is introduced before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Nell Redmond)
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Joey Logano is introduced before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Chuck Burton)
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Jimmie Johnson (48) leads Kasey Kahne (5) during the final laps of NASCAR Sprint Cup Series All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. Johnson won…
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Jeff Gordon waves to fans as he is introduced before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Nell Redmond)
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Kyle Busch is introduced before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Chuck Burton)
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Crew members push Kasey Kahne's car during introductions before the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Nell Redmond)
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Jimmie Johnson celebrates with his crew in victory lane after winning the NASCAR All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. (AP Photo/Nell Redmond)
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Jimmie Johnson (48) makes a pit stop during the NASCAR Sprint Cup Series All-Star auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 18, 2013. Johnson won the race. (AP Phot…
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In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, points to an ingredient label while discussing his stud…
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In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, who heads the University of North Carolina Food Research Program, poses for a photo in his Chapel Hill, N.C., office. P…
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In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, discusses his study, what foods Americans are purchasin…
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In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, poses for a photo in his office at UNC-Chapel Hill. Pop…
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In this photo released by China's Xinhua News Agency, rescuers work at the site where a blast ripped through an explosives manufacturing plant in Caofan Township of Zhangqiu City, east China's…
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A massive blast ripped through an explosives factory Monday in eastern China, killing five people and leaving another 20 missing, state media reported.
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In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, discusses his study, what foods Americans are purchasin…
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