In one of the countries who typically write the month and then the day when writing out the date, someone cleverly noticed that today is 3.14 and decided it should be celebrated as Pi Day. And of course, the best way to celebrate is by eating pie, which besides being a homophone for pi is also round and therefore pi is useful for figuring out just how much pie you have. Starting a few years back some of our grad students starting bringing in pie for pi day and I'm happy to announce that tradition continues... I'm munching on a piece of apple pie right now.
And for an extra special geek bonus to the day, it is also Albert Einstein's birthday!