3.14159265358979...

The design from a great t-shirt my sister-in-law has.

Today, March 14th, is Pi Day.  3-14, get it?

Who knew? Not me, at least until I couldn't sleep at 4am and came across this CNN article...

The holiday has gained popularity worldwide every year during the last decade as enthusiasm has spread on the Web.  One of the oldest, if not the first, established Pi Day celebrations is at the Exploratorium in San Francisco, California, which boasts 22 years of pi mayhem. The day is even recognized by the U.S. government: Last March, the U.S. House of Representatives passed a resolution supporting Pi Day and encouraging schools to teach children about the number. 

Theoretically pi's digits will continue on indefinitely without ending in repetition.  That also means, mathematicians theorize, that any string of numbers you can imagine is somewhere in pi -- for instance, look for your birthday. Coincidentally, "360," the number of degrees in a circle, occurs at digits 358 to 360. 

Pi's digits were calculated out to a record 2.7 trillion places in December by French computer scientist Fabrice Bellard.

So there you have it. Happy Pi Day!

P.S. If you've never seen this video of Daniel Tammet, it's definitely worth a watch.