U.S. smashes 27-year-old record in women's 4x100
London Olympics Athletics Women
United States' women's 4 x100-meter relay team members, from left, Tianna Madison, Bianca Knight, Carmelita Jeter and Allyson Felix, 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)






