Science
Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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If a jet cruises at 575 mph, how far will it go in 12 hours?
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How many jointed legs does an adult insect possess?
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Which of these scientific terms is defined as the solid surface layer of a planet or moon?
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