Thursday 3.14 has now come and gone (it’s Friday morning here in the USA), but I was reminded yesterday that it was ‘Pi(e) Day’ : the 25th Annual Pi Day, actually. Pi Day celebrates the curious mathematical constant that says no matter how small or how large a circle is, its circumference is 3.14* times its diameter. There is even a geeky website for Pi day, at http://www.piday.org. They have a cute t-shirt picture on there that shows 3.14 can be made to read ‘pie’ when looked at in the mirror. There is also a page that shows pi to a million decimal places.

*3.14 is just the approximate value. The constant is an irrational number which means it has an infinite amount of decimal places with no pattern.