Science
What space object did some ancient cultures rely on to tell the passage of time?
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Which of these is a scientific definition for the term "matter"?
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How many tons of meteor dust fall to Earth every day?
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What is a long balloon filled with helium generally called?
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The definition of "clouds composed of small particles, mostly ice crystals" best fits which science term?
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Besides the V rockets for Germany, what was the most famous rocket that von Braun developed?
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What dust-like particles are only found on plants like ferns, mosses and mushrooms?
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