character: Roger Penrose
topic: Penrose Conjecture and Black Hole Singularities
grade: 12
subject: Physics
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character: Stephen Hawking
topic: The Nature of Black Holes
grade: 12
subject: Physics
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character: Albert Einstein
topic: General Relativity and Gravity
grade: 12
subject: Physics
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character: John Archibald Wheeler
topic: The Concept of Black Holes
grade: 12
subject: Physics
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