Some of Africa's top distance runners will test their speed and endurance in Sunday's New York City Marathon. It's the 50th anniversary of the big race, and VOA's Gwen Outen will have a preview on the show.The women's field is led by Kenya's Peres Jepchirchir, who will try to become the first Olympic champion to win the race. More than 30,000 runners are expected to line up in New York on Sunday. In this 2016 photo, runners cross the Verrazzano-Narrows Bridge.