Science
Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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Which insect is the closest relative to the grasshopper?
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What are plants that need two years to complete its life cycle?
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Which is the planet with the greatest average density?
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Who discovered that a moving magnet generates electric current known as electromagnetic induction?
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What university did astronomy and space science theorist Carl Sagan teach at?
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What is any picture of an object made with a mirror or lens called?
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