The first bomb was invented and developed in the 13th century using gun powder in China.
Although the first actual nuclear bombs and nuclear weapons were invented and developed during the World War II as part of the Manhattan Project by the United States, although with significant contributions from scientists such as Edward Teller and J. Robert Oppenheimer.
J. Robert Oppenheimer also led the design and the research of the atomic bomb at the Los Alamos Laboratory.
Edward teller also then later contributed to the development of the hydrogen bomb.
J. Robert Oppenheimer was the director of the Los Alamos Laboratory in which the atomic bombs called "Little Boy", and "Fat Man", were designed.
Edward Teller was a key figure in the development of the hydrogen bomb, which is also known as the thermonuclear weapon.
Stanislaw Ulam collaborated with Edward Teller on the design of the first hydrogen bomb.
The "Little Boy" atomic bomb was dropped on Hiroshima and the atomic bomb "Fat Man", was dropped on Nagasaki.
After the Little Boy atomic bomb designed at Los Alamos was dropped on Hiroshima, J. Robert Oppenheimer also talked to assembled workers and said that he was “proud” and his only regret was not getting the bomb fast enough to use against the Germans.