5 Things You Didn't Know About the Metric System

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Installation Begins on the 10,000 Year Clock

Installation Begins on the 10,000 Year Clock

Construction has begun on a massive clock inside a Texas mountain that will keep time for the next 10 millennia. HowStuffWorks looks at the project.

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  • "A Brief History of Measurement Systems."National Institute Of Standards and Technology. (September 9, 2011) https://standards.nasa.gov/history_metric.pdf
  • Associated Press Style Book. (September 9, 2011) http://www.apstylebook.com/
  • Brumfiel, Goeff. "Kilogram adjustment courts controversy." Nature. Jan. 28, 2011.(September 9, 2011)
  • http://www.nature.com/news/2011/110128/full/news.2011.51.html
  • National Institute of Standards and Technology Web site. (September 9, 2011) http://www.nist.gov/index.html
  • "The International System of Units." Bureau International des Poids et Mesures. (September 9, 2011) http://www.bipm.org/en/si/
  • "National Metric Week in October." National Council of Teachers and Mathematics. (September 9, 2011) http://www.nctm.org/news/content.aspx?id=10248
  • "Practical Guide to the International System of Units. Colorado State University. (September 9, 2011) http://lamar.colostate.edu/~hillger/pdf/Practical_Guide_to_the_SI.pdf
  • "Toward a Metric America." National Institute of Standards and Technology. May 2002. (September 9, 2011) http://ts.nist.gov/WeightsAndMeasures/Metric/upload/1136a.pdf
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