Andrew Hanson is the son of Alfred Hanson and Henry Frisch is the son of David Frisch. Alfred and David were both physicists who worked on the Van de Graaff long tank, first at the University of Wisconsin and then at Los Alamos. Both physicists were using the long tank to measure neutron cross sections in plutonium. In this interview with Robert S. Norris, Frisch and Hanson discuss their father’s work at Los Alamos and relay a number of anecdotes their parents told them about life at Los Alamos. Hanson remembers a story his mother told him about his father accidentally vaporizing the world’s supply of metallic plutonium. Frisch and Hanson also recall a performance of the opera “Dr. Atomic” and talking to the actors about the actual people they portrayed. The pair also ask about the source of plutonium for several experiments and the existence of a third bomb on Tinian.