Science

What is the closest value of pi?

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Earthmen first sent a spacecraft to which planet?
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About how often does Halley's Comet return?
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What is the distance that light travels in a year called?
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What is the ripened ovary of a plant containing the seeds?
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Which is the planet with the greatest average density?
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Halley's Comet is predicted to appear again in which year?
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What pair of sensory organs are located near the front of an insect's head?
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