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What is an LED?

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What is the repeated sound when sound waves bounce off other objects called?
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What type of tissue makes up the femur?
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Halley's Comet is predicted to appear again in which year?
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Which animal's chirps can be used to tell the temperature?
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Which is the slowest orbiting planet?
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What kind of power do sailboats use?
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Which is not one of the four schools of family therapy?
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What metal is used for most electrical wire and cable?
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