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Pi - EnchantedLearning.com
That Time Pi was Almost Legally Changed to 3.2 or 4 - YouTube
The Number Pi (3.14159)
2 Pi or Not 2 Pi?—Wolfram Blog
Some of my favorite XKCD comics
Pi: Facts and Figures
Excel Math: Pi Day Bulletin Board and Ideas for the Math Class
Pi -- from Wolfram MathWorld