Science
What does ER (of a cell) stand for?
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Deep trenches such as the Grand Canyon were formed by what process?
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How long does it take for Saturn to rotate completely on its axis (a typical day)?
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Who was the first President of the "Planetary Society", an organization of amateur astronomers?
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What spacecraft takes astronauts into space, orbits the Earth and can be flown more than once?
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In which constellation does the vernal equinox appear?
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