Some of you may remember the Eames film “Powers of Ten,” which dramatically showed changes of scale from the microscopic to the cosmic. I don’t think you can view the film on the web, though you can read about it and see other stuff on their web site.
Well, there’s a java applet from Florida State University called “Secret Worlds: The Universe Within,” which you can view on the web, and it’s a very dramatic demonstration of the same concept—from the cosmos to the quark. Take a look at it, then show it to a young person. Or an old person. Or even your spouse (which is how I heard about it).