Shortly after winning this race, Tyson Gay acknowledged failing a drug test. He is believed to have used a cream provided by an anti-aging specialist whose clients include several NFL players, reports ProPublica. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images

Sweden's Emma Green Tregaro sports red nails as she waits to compete in the women's high jump final at the 2013 IAAF World Championships in Moscow. Green Tregaro was told her rainbow-colored nail violated track's rules against political statements. Adrian Dennis/AFP/Getty Images hide caption

itoggle caption Adrian Dennis/AFP/Getty Images