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What was the first sound-recording device called?
Science
What was the first sound-recording device called?
Telegraph
Phonograph
Photograph
Telephone
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What is the irregular and instantaneous motion of air called?
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What makes up about 70 percent of most living things?
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What does MAST stand for in medical terms?
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A meter is equivalent to how many millimeters?
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What is caused when the Moon moves into the Earth's shadow?
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What is the name of an instrument that records vibrations in the Earth's crust?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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