Science
What is a return of the electron beam to the top of a television picture tube?
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Which of these is defined as "part of the electromagnetic spectrum that contains visible light"?
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What type of simple machine is used on a flag and flag pole?
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Who discovered that a moving magnet generates electric current known as electromagnetic induction?
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What scientist is credited with developing the first vaccine?
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What is energy from the internal heat of the Earth called?
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