Science
What space object did some ancient cultures rely on to tell the passage of time?
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To which part of physics does the Archimedes' Principle refer?
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What university did astronomy and space science theorist Carl Sagan teach at?
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What metal is used for most electrical wire and cable?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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The term, "black hole", was named by American physicist, John Wheeler, in which year?
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What is the scientific term for the cells responsible for root growth?
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