Ngong, Kenya (CNN)It's early morning in the Ngong Hills, on the edge of the Great Rift Valley, and a group of athletes huddle together in prayer in tracksuits and long pants. It's notoriously chilly this time of year. The runners set off from their camp, a converted orphanage, at a modest pace, hopping over puddles and dodging boda boda bikes. Ngong is a haven for Kenyan runners, the most storied middle-distance champions on the planet, and it's not unusual to bump into an Olympian on the dirt roads here. But these runners are refugees. They have no flag or country. They fled war and famine -- overcoming enormous odds to be contenders for the world's biggest stage at the Rio Olympics. An...
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