The federal government and companies responsible for nuclear bomb production and atomic waste storage sites in the St. Louis area in the mid-20th century were aware of health risks, spills, improperly stored contaminants and other problems but often ignored them, according to documents reviewed by The Associated Press. Federal health investigators have found an increased cancer risk for some people who, as children, played in a creek contaminated with uranium waste. A landfill operator is spending millions to keep underground smoldering from reaching nuclear waste illegally dumped in the 197...