character: Albert Einstein
topic: Co-signing the letter to President Roosevelt encouraging nuclear research
grade: 11
subject: Physics
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character: Leo Szilard
topic: Co-author of the letter to President Roosevelt urging for nuclear research
grade: 11
subject: Physics
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character: President Franklin D. Roosevelt
topic: Recipient of the letter advocating for nuclear weapon development
grade: 11
subject: Physics
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character: J. Robert Oppenheimer
topic: Key figure in the Manhattan Project that followed the letter
grade: 11
subject: Physics
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