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Pi Day

Pi Day
Monday, March 14
http://www.piday.org

Celebrate the wonders of mathematics by calculating the diameter, or even the surface area, of a delicious pie.  Any flavour will do, as long as it's circular.

If you prefer to write dates in the day/month/year format, and prefer expressing irrational numbers as fractions, you may celebrate on
July 22.

But March 14 is
Einstein's birthday, so do something visionary, whether it's pi-related or not.

And if you enjoy being a mathematical heretic, you can celebrate
Tau Day on June 28 instead.