On August 6 and 9, 1945, the United States dropped two atomic bombs on Hiroshima and Nagasaki in Japan, the first use of nuclear weapons in human history. The two atomic bombs were called "Little Boy" and "Fat Man", respectively.
"Little Boy" was the first atomic bomb to be dropped, and its **yield was about 150,000 tonnes of TNT equivalent. The atomic bomb used uranium-235 as nuclear fuel, and it was designed and built at the Los Alamos Laboratory in New Mexico. Since the "Little Boy" was not adequately tested at the time of dropping, its ** effect was not exactly as expected. However, it still caused great damage and people**.
"Fatty" was the second atomic bomb to be dropped, and its **yield was about 220,000 tonnes of TNT equivalent. The atomic bomb used plutonium-239 as nuclear fuel, and it was designed and manufactured at the Hanford plant in Washington state. "Fat Man" was well tested when it was dropped, so its ** effect was more in line with expectations than "Little Boy". It caused even more damage and personnel than the "little boys".
The dropping of these two atomic bombs led to Japan's surrender in World War II, and at the same time caused global concern and controversy over nuclear **. In the decades that followed, nuclear weapons became the focus of global attention, and efforts were made to control and limit the spread of nuclear ** to avoid a repeat of tragedies like those in Hiroshima and Nagasaki.