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Olympics Day 7 - Swimming

Michael Phelps of the United States exits the pools afer winning the Men?s 100m Butterfly Final on Day 7 of the London 2012 Olympic Games at the Aquatics Centre on August 3, 2012 in London, England. (Photo by Paul Gilham/Getty Images)

Olympics Quiz: 12 questions from the '12 Games

August 13, 2012

As the 2012 London Games come to an end, we thought some expert Olympic fans might want to test their knowledge with a little quiz. -- By Chris Wilson, Yahoo! Sports