Happy Pi Day!

This is March 14, otherwise known as "Pi Day" (3.14)
Math enthusiasts are celebrating.
So if you're looking for an excuse to celebrate, a few pertinent websites here:

http://www.joyofpi.com/thebook.html

http://www.exploratorium.edu/pi/

http://tinyurl.com/adjvyx (excellent book)

http://en.wikipedia.org/wiki/Pi

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