Science

About how often does Halley's Comet return?

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What is the hardest known natural material?
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Which scientific term means "measure of resistance to flow in a liquid"?
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Which of the following is not a planet in our solar system?
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Which song was used to wake up the first Space Shuttle crew in orbit?
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What is the ripened ovary of a flower better known as?
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What is any picture of an object made with a mirror or lens called?
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How many rings does the planet Saturn have?
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Which animal's chirps can be used to tell the temperature?
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