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Handy Facts
A collection of handy facts about math, words, dimensions, space, and lots of useful and hard-to-find data.
http://www.handyfacts.com/
Leonardo Almanac
Collection of technology reference resources and statistics.
http://mitpress2.mit.edu/e-journals/LEA/LEA2002/LEA/index.htm
Metric Conversion
Collection of information on unit conversion and metrics.
http://www.metric-conversion.org/Default.htm
SpaceRef Almanac
A broad source of space-flight information - daily updates, calendar of events, directory of space-related sites, discussion fora, and gateways to space science and astrobiology and the 'Whole Mars Catalog'. A service of Discovery.com.
http://www.spaceref.com/
StarDate
Plan your backyard stargazing with the celestial information gleaned from this web.
http://stardate.org/
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