character: Carl Sagan
topic: Cosmos: A Personal Journey
grade: 11
subject: Physics
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character: Carl Sagan
topic: Public Understanding of Science
grade: 11
subject: Physics
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character: Clyde Tombaugh
topic: Discovery of Pluto
grade: 11
subject: Physics
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character: Neil deGrasse Tyson
topic: Modern Cosmology and Science Communication
grade: 11
subject: Physics
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