Today is February 29th, which only comes about every four years because of Leap Year. And if you wanna know why exactly we have that, The Christian Science Monitor's website has a rather informative article about the Gregorian Calendar and how it came about.
(I learned some new stuff reading that. Like: because of a deal brokered by Saint Patrick, today is the one day during four whole years that the lady gets to propose to her man! And if the dude says "no" he's obliged to give her a new dress and some gloves.)
And over at io9.com there's the strange but true tale of how there was once a February 30th.
