Photos 1/5 Student explore the Howell Prairie during a STEM program. Photo courtesy of 2/5 Interpretive Specialist leading a STEM program. Photo courtesy of 3/5 Weldon Spring Uranium Feed Materials Plant, circa 1957. Photo courtesy of 4/5 Female employee of Weldon Spring Uranium Feed Materials Plant. Photo courtesy of 5/5 Weldon Spring Uranium Feed Materials Plant workers pose with 3,000-pound direct ingot (also known as a "dingot"). Photo courtesy of