Science
A "philatelist" is a what?
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Who discovered the supernova and was the first to theorize that stars "die"?
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What is the repeated sound when sound waves bounce off other objects called?
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How often does sunspot activity reach its lowest point?
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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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Who discovered the rotating magnetic field that is the basis of Alternating Current?
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Which of these is a virus that doesn't immediately cause damage to tissue?
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