Enrico Fermi: An Italian physicist who played a key role in the development of the atomic bomb as part of the Manhattan Project. He led the team that achieved the first controlled nuclear chain reaction.
J. Robert Oppenheimer: An American theoretical physicist who directed the Los Alamos Laboratory during the Manhattan Project. He is often referred to as "the father of the atomic bomb."
Hiroshima and Nagasaki: The two Japanese cities where atomic bombs were dropped by the United States in August 1945, leading to Japan's surrender and effectively ending World War II.