Inside Kenya’s Rift Valley, which produces the world's best marathon runners year after year
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Kenya is home to many of the best marathon runners in the world.

It's no coincidence. Many of these world-class runners come from Iten, the "city of champions," a town that sits on the edge of Rift Valley, 7,000 feet above sea level.

Scientists and runners have questioned how they keep winning.

Harvard biologist Daniel Lieberman, who studied the evolution of running, told NPR it was impossible to quantify — it's a mixture of factors like training, culture, biology, and...

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