Science
What space object did some ancient cultures rely on to tell the passage of time?
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What scientist first showed that a changing electric field produces a magnetic field?
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Who discovered the rotating magnetic field that is the basis of Alternating Current?
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Which of these is a famous astronomer for whom a comet was named?
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What are materials that come from the earth called?
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What is defined as the average distance from the Earth to the Sun?
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Who was the first person to use a telescope for astronomy?
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