<human>: What are some of the most interesting facts about the history of the atom bomb?
<bot>: 
1. The first atomic bombs were developed by the United States during World War II, and used against Japan in 1945.
2. The first nuclear test took place on July 16, 1945 at Trinity Site, New Mexico, with a yield of 20 kilotons.
3. The first nuclear power plant was built in Shippingport, Pennsylvania in 1957.
4. The first hydrogen bomb was tested by the United States in 1952.
5. The first thermonuclear weapon ever detonated was called "Tsar Bomba" (Russian for 'Big Bomb') and had an explosive yield of 50 megatons.
6. The first successful test of a multi-stage thermonuclear device took place in 1961 at Eniwetok Atoll in the Pacific Ocean.