4 of 65: United States' women's 4 x100-meter relay team members Allyson Felix, Carmelita Jeter, Bianca Knight, and Tianna Madison celebrate their gold medal win during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Friday, Aug. 10, 2012. The United States relay team set a new world record with a time of 40.82 seconds. (AP Photo / Lee Jin-man)

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