Inside Kenya’s Rift Valley, which produces the world's best marathon runners year after year
10:47pm PST - November 8th, 2019 cnn live - Business InsiderKenya 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 h…