U.S. swimmer Dana Vollmer

Associated Press
Megan Romano, from left, Dana Vollmer and Chelsea Nauta dive at the start of a heat in the women's 200-meter freestyle preliminaries at the U.S. Olympic swimming trials, Wednesday, June 27, 2012, in Omaha, Neb. (AP Photo/Mark J. Terrill)

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Dana Vollmer won gold and broke a world record after completing the 100 butterfly at the Aquatics Centre in London.

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