Science
What is it called when the Earth, Sun and Moon lie in a straight-line configuration?
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Awarded the Nobel Prize in 1977, John H. Van Vleck's area of expertise is in what?
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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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Which of these was one of the original universal elements?
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Which inhospitable desert holds the world's richest deposits of dinosaur remains?
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Which characteristics do organisms use to help them survive in their environment?
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