What would the Olympics be without a doping controversy? The 16-year-old Ye Shiwen of China blew away the competition on the final lap of the women's 400m individual medley race. Her final 50m was faster than American star Ryan Lochte's final 50m in the men's version of that same race. A longtime U.S. swimming coach called the performance unbelievable. And it's prompted a debate over whether Ye is just the latest Chinese swimmer to excel because of doping.