[ad_1] When Diane Scheig’s father, Bill, came home from work at the Mallinckrodt factory in St. Louis, he would strip down in their garage and hand his clothes to her mother to immediately wash, not daring to contaminate the house with the residue of his labors. Mr. Scheig, an ironworker who helped build the city’s famous arch, never told their family exactly what he was doing at the plant, where scientists first began processing uranium for the Manhattan Project in 1942. But by the age of 49, he had developed…