Hidden math in the Simpsons

OK, for those Simpsons lovers and math geeks out there, you probably already know this. However, for those who aren't into both (or either), there's a good article from Science News about the frightening number of little math jokes in the show. Quite frankly, I've always been impressed with the massive volume of obscure references in the Simpsons, including the Ayn Rand School for Tots and an enormous variety of others.