Science

About how often does Halley's Comet return?

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If you're talking about electricity, what does "DC" stand for?
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The Horsehead Nebula can be found in what constellation?
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What is the name for a body in orbit around the Sun?
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What nearly colorless gas is a form of ozone?
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What is the full name for CFCs?
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Pressure exerted by the atmosphere at a given point is known as what?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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What specifically is a bezoar called those results from persimmon ingestion?
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