It's Pi Day

You remember π, no? It's the ratio of a circle's circumference to its diameter. It's an irrational number, as well as transcendental, and thus never repeats its decimal expansion:

π = 3.14159265358979323846264338327950....

Today is 3/14, or Pi Day. Or perhaps, we should call it, National Good-Enough Day, a day for controlled approximations :)

POSTSCRIPT: This is really scary - familiar song, new lyrics (MP3). More here.