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What was the first sound-recording device called?
Science
What was the first sound-recording device called?
Phonograph
Telegraph
Telephone
Photograph
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What is the third brightest object in the Earth's sky?
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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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What is the formal name for climate studies?
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A meter is equivalent to how many millimeters?
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Which of these objects is an example of a simple machine?
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