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  1. Development of nuclear weapons was the motivation behind early research into nuclear fission which the Manhattan Project during World War II (September 1, 1939 – September 2, 1945) carried out most of the early scientific work on fission chain reactions, culminating in the three events involving fission bombs that occurred during the war.

  2. Jun 28, 2022 · Kim has directed four nuclear tests—in February 2013, January and September 2016, and September 2017—and 160 missile tests, far exceeding the number of trials conducted under his father and ...

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