Science
What space object did some ancient cultures rely on to tell the passage of time?
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What is the female reproductive cell of flowering plants?
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When we add two forces, what do we call the answer?
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What are the loosely packed cells just inside the upper epidermis called?
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Who was the commander of the first U.S. Space Shuttle mission?
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Who discovered the rotating magnetic field that is the basis of Alternating Current?
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What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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