Science
Which of these is the best definition of a compound machine?
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12.36 Microseconds is the equivalent to one unit of what?
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How many tiles make up the outer "skin" of Spaceship Earth, in EPCOT?
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What sort of electricity do you get when you rub two balloons and they stick together?
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Which branch of science did young Carl Sagan tell his grandfather he wanted to practice?
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What is a return of the electron beam to the top of a television picture tube?
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Which of the following books has Carl Sagan not authored?
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