character: Albert Einstein
topic: Letter to President Roosevelt advocating for nuclear research
grade: 11
subject: Physics
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character: Leo Szilard
topic: Co-writer of the letter to President Roosevelt
grade: 11
subject: Physics
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character: President Franklin D. Roosevelt
topic: Recipient of Einstein's letter
grade: 11
subject: Physics
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character: J. Robert Oppenheimer
topic: Pivotal figure in the Manhattan Project influenced by Einstein's advocacy
grade: 11
subject: Physics
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