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Web Sites > Profile: US Library of Congress - How does an hourglass measure time?

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	Title:		US Library of Congress - How does an hourglass measure time?
	Description:		Answers questions about how an hourglass keeps time and what are the contributing factors determining how long an hourglass lasts.
	Category:		Kids and Teens > School Time > Science > Astronomy and Space > Time
	URL:		http://www.loc.gov/rr/scitech/mysteries/hourglass.html

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