character: Albert Einstein
topic: Letter to President Roosevelt
grade: 11
subject: Physics
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character: Leo Szilard
topic: Co-signatory of the letter to Roosevelt
grade: 11
subject: Physics
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character: Enrico Fermi
topic: Contributed to nuclear fission research
grade: 11
subject: Physics
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character: J. Robert Oppenheimer
topic: Key figure in the Manhattan Project
grade: 11
subject: Physics
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