The Simpsons and math

I recently came the following article concerning the mathematical jokes that can be found in various episodes of the Simpsons: http://www.theguardian.com/tv-and-radio/2013/sep/22/the-simpsons-secret-formula-maths-simon-singh.

For a more detailed listing of mathematical references, I highly recommend http://www.simpsonsmath.com (or http://mathsci2.appstate.edu/~sjg/simpsonsmath/), maintained by Dr. Sarah J. Greenwald of Appalachian State University and Dr. Andrew Nestler of Santa Monica College. I’ve used the “r dr r” joke in my calculus class many times, and each time it was a hit.