Science
What university did astronomy and space science theorist Carl Sagan teach at?
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Which kind of tree is most often struck by lightning?
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Which of these was one of the original universal elements?
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Which parts of a flower are often brightly-colored and have many different shapes?
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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 electronic device only allows current to flow in one direction?
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A covering of ice crystals on the ground is known as what?
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