Happy Pi Day! You know, that über-cool holiday when math geeks from around the world (or at least from countries where the month precedes the day) gather to recite digits, gorge on pie, and fete that elusive number in all its irrational glory.

Here are our picks for Pi Day celebration:

1. Head over to San Francisco's Exploratorium in person or on Second Life for pi shrines and circumambulation starting at 1:59 (3.14159, get it?).

2. Check out Harvard's 3.14-minute pie-eating contest.

3. Write a "piku" or, better yet, a "piem," in which each word corresponds to a digit (read Mike Keith's "Poe, E.: Near a Raven" for inspiration).

4. Memorize the first 1,000 digits.

Oh, and while you're at it, a round of "Happy Birthday" might be nice—today would be Einstein's 128th.