Science

What is an LED?

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Mariner IV sent the first pictures of which planet back to earth?
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The science term "precipitation" is best defined as which of these?
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Where is the asteroid belt found?
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Who was the command module pilot on Apollo 17?
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The modern equivalent of Aristotle's polis is an independent unit called what?
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How many coulombs does one ampere-hour equal?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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What fuels were formed from the decayed remains of plants and animals?
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