REVA, S.D. — The niche sport of turtle racing has recently gained attention from National Geographic, which published an article on April 13 about its history and prevalence among small towns in the Great Plains. For someone living in Dickinson, seeing a turtle race in action only requires an hour-and a half drive south. Reva, South Dakota, hosts an annual turtle race every late July, with this year’s race happening July 26. It will mark the 50t…