Science
What electronic device only allows current to flow in one direction?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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What is the final stage of ecological succession called?
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How many times more does Jupiter radiate energy than what it receives from the sun?
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What kind of electromagnetic radiation arises only from nuclear excitations?
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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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Colors other than white, black and the pure greys are known as what?
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