It's inevitable to link to this now: http://www.youtube.com/watch?v=UIKGV2cTgqA http://www.youtube.com/watch?v=UIKGV2cTgqA It's Tom Lehrer, about 50 years ago

It's inevitable to link to this now: http://www.youtube.com/watch?v=UIKGV2cTgqA http://www.youtube.com/watch?v=UIKGV2cTgqA It's Tom Lehrer, about 50 years ago, explaining subtraction in the context of the "new" math (the base-8 stuff starts at 2:40). Worth a listen.