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Gabrielle Douglas

In this Thursday, Aug. 2, 2012 photo, U.S. gymnast Gabrielle Douglas performs on the balance beam during the artistic gymnastics women's individual all-around competition at the 2012 Summer Olympics, in London. (AP Photo/Gregory Bull)

A look back at the London Olympics

A look at some of the most memorable photos from the London 2012 Olympics. -- By Carla Thorpe, Yahoo! Sports