Science

Earthmen first sent a spacecraft to which planet?

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A covering of ice crystals on the ground is known as what?
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When did Panama move from South America to North America?
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Which parts of a nerve cell send out signals?
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Of which body system is the kidney an organ?
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What is the speed of sound called?
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Which state saw the first self-sustaining nuclear chain reaction in 1942?
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What is an LED?
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Mariner IV sent the first pictures of which planet back to earth?
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