Science

Earthmen first sent a spacecraft to which planet?

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What was the first sound-recording device called?
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What type of simple machine is used on a flag and flag pole?
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Which planet is the impact crater named the "Caloris Basin" found?
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How do scientists refer to the direction from which the wind is blowing?
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What is a body's resistance to changes in motion or speed called?
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What type of cell doesn't have membrane around its nuclear material?
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Which of these particles was discovered first?
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Which of the following books has Carl Sagan not authored?
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