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Manning successful in Denver debut, 31-19

Olympic gold medalist Missy Franklin, second from left, laughs while in the coin toss huddle with the Denver Broncos and the Pittsburgh Steelers players before their NFL football game, Sunday, Sept. 9, 2012, in Denver. (AP Photo/Joe Mahoney)

Swimming phenom Missy Franklin

Missy Franklin's four gold medals in London haven't changed her personality one bit – she's still a happy-go-lucky teen.