Runners train in Ngong, Kenya, in 2012. The country has produced the world's best distance runners for decades, and most belong to the Kalenjin people. Michael Steele/Getty Images hide caption

itoggle caption Michael Steele/Getty Images

Boston Red Sox relief pitcher Koji Uehara (19) and catcher David Ross celebrate after Boston defeated the St. Louis Cardinals in Game 6 of World Series Wednesday in Boston. Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP

For Game 6, the World Series returns to Boston's Fenway Park, where the home team hasn't clinched a championship since 1918. Here, Red Sox players warm up in front of the Green Monster. Jared Wickerham/Getty Images hide caption

itoggle caption Jared Wickerham/Getty Images