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Moomba Festival Birdman Rally

Jet ski riders perform as part of the Moomba Festival on the Yarra River on March 11, 2012 in Melbourne, Australia. (Photo by Robert Cianflone/Getty Images)

Olympics Quiz: 12 questions from the '12 Games

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