Though, at some times and places in history, February 24th was considered to be the Leap Day. For the more science-oriented folks, Phil Plait explains why we have leap days.
More like this
Or at least a certain corner of Canadian politics. For some definitions of "blow up."
My first Common Lisp programming job was for Mercury Scheduling (no longer around) working on the back end of airline crew control software.
The two most amusing explanations for why we have leap years that I've heard came from creationists: