Jim Nolan is trying to make sense of his grandfather’s role in helping build the atomic bomb. His grandfather, Dr. James F. Nolan, was a physician on the Manhattan Project. He served as physician to the secret research community in Los Alamos, New Mexico. He delivered babies. He helped plan safety measures for the first A-bomb tests. And he escorted the so-called “Little Boy” atomic bomb from Los Alamos to the base where it would take off to be dropped on Hiroshima.