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Interesting Links

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Here are a few interesting sites that I've found in my travels:

www.mathproblems.info Mike Shackleford's math pages. I've done the first 106 problems, so feel free to send me comments
http://www.qbyte.org/puzzles/ Nick's Puzzle pages. This is another well-constructed site with a variety of puzzles with solutions.
physics.nist.gov/cuu/Units/current.html Definitions of the SI base units (essentially all units of measurement are defined relative to these units).
physics.nist.gov/Pubs/SP811/appenB.html This is the only repository of conversion factors for units of measurement that I have ever found, which is both comprehensive and accurate. Basically, they know which conversions are exact and they know which units have inconsistent definitions, and they don't introduce rounding error without telling you. Do not go to www.nist.gov for this info!

Please send responses to my email address is mathrec at this domain