character: Stephen Hawking
topic: Risks of Contacting Alien Civilizations
grade: 9
subject: Biology
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character: Carl Sagan
topic: Drake Equation and Search for Extraterrestrial Intelligence
grade: 9
subject: Biology
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character: Neil deGrasse Tyson
topic: The Fermi Paradox and the Possibility of Alien Life
grade: 9
subject: Biology
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character: Arthur C. Clarke
topic: Speculations on Alien Life Forms and Their Potential Threats
grade: 9
subject: Biology
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