Science
In math, "pi" is equal to?
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What was so unusual about the Mercury space flights?
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Which of these objects is an example of a simple machine?
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What scientist first showed that a changing electric field produces a magnetic field?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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What are many cells that form together to provide a certain function called?
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The definition of "clouds composed of small particles, mostly ice crystals" best fits which science term?
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What famous scientist introduced the concept of "space-time"?
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