<human>: What are some of the most interesting facts about the history of the atomic bomb?
<bot>: 
1. The first nuclear weapon was tested by the United States in July 1945, near Alamogordo, New Mexico. It was called "Little Boy" and had a yield of approximately 10 kilotons.
2. On August 6, 1945, the United States dropped an atomic bomb on Hiroshima, Japan, killing at least 70,000 people.
3. On August 9, 1945, the United States dropped another atomic bomb on Nagasaki, Japan, which killed at least 40,000 more people.
4. The United States developed the first hydrogen bombs in 1954, which were significantly larger than their predecessors. These weapons had yields of up to 1 megaton.
5. During World War II, the US military used the atomic bombs against Japan as part of Operation Crossroads.