Science
How many Earth years does it take Mars to go around the Sun?
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Where on the moon did people first land a spacecraft?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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If you're talking about electricity, what does "DC" stand for?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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What scientist is credited with developing the first vaccine?
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Which of these is a scientific definition for the term "matter"?
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What is any picture of an object made with a mirror or lens called?
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