You'll find it, along with other phun physics songs at
http://www.scientainment.com/songs.html
You'll need the RealPlayer plugin to hear the songs, but the site should help you get that in place.
Previous "Did You Know" sections are
The Women Inventor of the Dishwasher
Margaret Mead is depicted on a U.S. Postal Stamp
Maria Merian on the U. S. Postage Stamp