Science
What is another name for a "shadow clock"?
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How often does sunspot activity reach its lowest point?
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Which of these was one of the original universal elements?
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Deep trenches such as the Grand Canyon were formed by what process?
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What inherited syndrome is believed to be part of the make up of many serial killers?
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What is the rhythmic repetition surrounding the planetary day called?
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Which 5" telescope would have an optical tube with the shortest length?
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Approximately how many miles of wire are there in a 737?
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Which of these is a scientific definition for the term "matter"?
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