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The Hourglass

  Link Details for: The Hourglass
Link Title: The Hourglass Open in a new window
Link URL: http://www.uh.edu/engines/epi1469.htm
Link Details: The University of Houston College of engineering, describes how an hourglass works and also provides interesting facts about this timekeeper.
Category: Top : Kids_and_Teens : School_Time : Science : Astronomy_and_Space : Time
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The Hourglass