jdavidb writes: "Dr. John Conway (author of the famous "Game of Life") has a wonderful algorithm for finding the day of the week for any year in history that you can do in your head. It's so easy and elegant, in fact, that someone has decided to write a poem about it. Shades of DeCSS haikus! What a marvelous example of how mathematics is a form of (free and protected) speech. As if to further illustrate that computer code is just another form of speech, there is an implementation of this algorithm (in Perl of course)!"