Hundreds of thousands of people crowd Copacabana Beach in Rio de Janeiro on Sunday as Pope Francis celebrates the final Mass of his visit to Brazil. Security lapses, traffic chaos and other logistical snafus marred the visit. AFP/Getty Images hide caption

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Adam Nelson (left), has been awarded the gold medal in the men's shot put, after original winner Yuriy Bilonoh of Ukraine was found to have violated doping rules. Nick Laham/Getty Images hide caption

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Lance Armstrong at the 2000 Sydney Olympic Games, celebrating his bronze medal performance. Pedro Ugarte /AFP/Getty Images hide caption

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The Opening Ceremony of the London 2012 Olympic Games included a paean to the National Health Service, the U.K.'s socialized healthcare system. Gallo/Getty Images hide caption

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Oscar Pistorius of South Africa runs in the men's 200-meter event at the Paralympic World Cup in May. Some observers have suggested Pistorius receives an unfair advantage from his carbon-fiber "blade" legs. Michael Steele/Getty Images hide caption

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