Science
What is the substance that gives plants their green color?
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What space object did some ancient cultures rely on to tell the passage of time?
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What electronic device only allows current to flow in one direction?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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Who discovered the rotating magnetic field that is the basis of Alternating Current?
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What type of object does the "no-hair" theory describe?
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What process produces a duplicate of the original cell?
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