Science
How often does sunspot activity reach its lowest point?
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Which Apollo mission was launched on December 21, 1968, and spent Christmas in lunar orbit?
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What is a steep-sided circular depression commonly known as?
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Diabetes develops as the result of a problem with which specific organ in the body?
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Deep trenches such as the Grand Canyon were formed by what process?
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What is the 6th planet from the sun in our solar system?
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A ramp is an example of which of these simple machines?
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With 11,674 steps, where is the longest flight of stairs located?
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