character: Carl Sagan
topic: The Mysteries of Cosmology
grade: 12
subject: Physics
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character: Neil deGrasse Tyson
topic: Cosmology and the Universe
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: Brian Greene
topic: The Fabric of the Cosmos
grade: 12
subject: Physics
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