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Astronomy_and_Space
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Time
:
The Hourglass
Link Details for:
The Hourglass
Link Title:
The Hourglass
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
Link Type:
ScreenShot: