Have fun with physics on the web

Recently I learned how tomography works. I was wondering it for a long time. How couldn't I figure it out? It is so easy when you see it. Thanks go to Physics 2000 website of University of Colorado. They have a nice collection of physics Java applets. Probably Java applets are the best tools for science education available now.

Next fun site I encountered is The Museum of Unworkable Devices. It is an extensive collection of perpetual motion devices. There are very challenging ones. Don't spoil the fun by looking at the solutions right away.

Both links are via Uncertain Principles. Thanks!