In May 1942, National Defense Research Committee Chairman James B. Conant, who had been one of Oppenheimer's lecturers at Harvard, invited Oppenheimer to take over work on fast neutron calculations, a task that Oppenheimer threw himself into with full vigor.
En maio de 1942 James B. Conant, presidente do National Defense Research Committee e anteriormente un dos profesores de Oppenheimer en Harvard, invitouno a liderar o traballo nos cálculos de neutróns rápidos, tarefa a que Oppenheimer se encomendou enerxicamente.