Science
About how often does Halley's Comet return?
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Energy return of a radar signal after it has hit the target best fits which science term?
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If you're talking about electricity, what does "DC" stand for?
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Where can you find the smallest bone in the human body?
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What metal is used for most electrical wire and cable?
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What is the repeated sound when sound waves bounce off other objects called?
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Where is the observatory where Percival Lowell first theorized the existence of Pluto?
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Which of these objects is an example of a simple machine?
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