They have been reduced in physical size, increased in yield, made more durable and secure.
US
The Battle of Okinawa did not lead to the atomic bomb, this battle happened in 1945 just a couple of months before the Manhattan Project completed the atomic bomb which they had been working on since 1942. With or without the Battle of Okinawa the atomic bomb would have been finished at the same time and dropped on Japan at the same time.
It takes very little time to build an atomic bomb, once a country has the necessary industrial infrastructure to produce the fissile material.
An ultimatum was issued to Japan from Potsdam, but no mention of atomic bombs was made in it as they were classified and the only people at Potsdam cleared to discuss them were Truman and Churchill.The first time the Japanese were told of the atomic bomb was after the bombing of Hiroshima.
Hiroshima - August 6 1945 - 8.15 am Nagasaki - August 9 1945 - 11.02 am
The first atomic bomb used against mankind exploded at 8.15 over Hiroshima.
The first exploded over Heroshima, the second over Nagasaki.
Harry Truman
US
The Battle of Okinawa did not lead to the atomic bomb, this battle happened in 1945 just a couple of months before the Manhattan Project completed the atomic bomb which they had been working on since 1942. With or without the Battle of Okinawa the atomic bomb would have been finished at the same time and dropped on Japan at the same time.
Japan
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That city was destroyed by an atomic bomb on August 6 1945. It was the first time an atomic bomb was used against mankind.
never, but Leo Szilard who was working at Rutherford's lab at the time invented the atomic bomb in 1933.
Robert Oppenheimer, the lead scientist of the Manhattan Project, was tasked with developing the atomic bomb during World War II. He expressed mixed feelings about the bomb's destructive power and later reflected on its use, feeling a sense of regret and responsibility for its devastating impact. Oppenheimer's opinions were complex and evolved over time, but it's inaccurate to say he "wanted" the bomb to go off in a simplistic sense.
11.45
Hiroshima