Science

John Glenn was the first American to orbit the earth, in how long a flight?

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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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If you are caught in a sudden heavy rainfall of a showery nature, you are caught in a what?
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What is molten rock beneath the surface of the earth called?
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What is a return of the electron beam to the top of a television picture tube?
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If you're talking about electricity, what does "DC" stand for?
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What is the opening of a lens, which controls the amount of light?
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Who was the commander of the first U.S. Space Shuttle mission?
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What trees located in California are the tallest trees in the world?
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