Along with a bomb, a second airplane flying over Nagasaki dropped canisters containing scientific instrumentation. The canisters also contained copies of a personal letter several Manhattan Project scientists addressed to a prominent Japanese scientist. “You have known for several years that an atomic bomb could be built if a nation were willing to pay the enormous cost of preparing the necessary material,” the letter, written by the nuclear physicist Luis Alvarez, read. “Now that you have seen that we have constructed the production plants, there can be no doubt in your mind that all the
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