character: President Franklin D. Roosevelt
topic: Nuclear Weapon Development Advocacy
grade: 11
subject: Physics
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character: Leo Szilard
topic: Letter to Roosevelt on Nuclear Research
grade: 11
subject: Physics
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character: Albert Einstein
topic: Einstein-Szilard Letter
grade: 11
subject: Physics
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character: J. Robert Oppenheimer
topic: Manhattan Project and Nuclear Weapons
grade: 11
subject: Physics
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