character: Leo Szilard
topic: Nuclear chain reaction advocacy
grade: 11
subject: Physics
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character: Albert Einstein
topic: Letter to President Roosevelt regarding nuclear research
grade: 11
subject: Physics
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character: Enrico Fermi
topic: Development of the first nuclear reactor
grade: 11
subject: Physics
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character: J. Robert Oppenheimer
topic: Leadership of the Manhattan Project
grade: 11
subject: Physics
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