You know when you were little and you got sick on your birthday? It’s not quite the same thing, but I was down and out yesterday — on Pi Day! (I didn’t even get to wear my “cool” Pi sweatshirt.) So I bring you these little tidbits a day late.

What’s Pi Day, you ask? Flip back to yesterday’s calendar: March 14 or 3-14. Now think about the estimation of π or pi: 3.14. Ta-da!

Here are a few ways folks have celebrated Pi Day, thanks to the watchful eyes of my wonderful Math for Grownups readers.

Amherst College, 2004: “On March 14, or 3.14, students celebrated National Pi day by waking up at 6 a.m. and burning through 15 sticks of sidewalk chalk. Here, digits of pi trail off in front of Fayerweather Hall on National Pi Day. 2,010 digits of pi stretched from Valentine Dining Hall to Merrill Science Center.”

Photo courtesy of Amherst College website

Are Shakespeare’s Plays Encoded With Pi? Vi Hart strikes again. (And yes, it’s in iambic pentameter. Genius!)

3.14 ways to celebrate Pi Day, from Carol Pinchefsky at Forbes.com. 

Sand Art Video: If you’re a child of the 80s (like I am) or just love Tommy Tutone, click on this.

Oh, and what does my π sweatshirt look like? It says: Now I need a verse recalling pi. Can you figure it out?

Did you celebrate Pi Day? Tell us what you did in the comments section.

Belated Pi Day Celebration