Here's a great little article that tells you how to find the speed of light using a microwave oven a bar of chocolate.

http://www.taipeitimes.com/News/lang/archives/2007/08/26/2003375968

A very unique application using 'table top science' to find the standing wave distance.

Incidentally, one is more likely to find a fixed standing wave in the center of your Microwave.
So if you want your food to cook more evenly, and a little quicker, always place your food to one-side of the turntable.

I sent this article to my brother so he, his and his wife could do this experiment with their children.

Rallem,
How about a link to the article?