Jamaica's Usain Bolt reacts to his win in the men's 100-meter final during track and field in the Olympic Stadium, Sunday, Aug. 5, 2012. (AP Photo/Anja Niedringhaus)
Britain’s Mo Farah, left, reacts after winning gold ahead of United States’ Galen Rupp, right, in the men’s 10,000-meter final, Saturday, Aug. 4, 2012. (AP Photo/Kirsty Wigglesworth)