Simplicity! I'm in love. Thanks. Actually, your simple design is not the only one to make my day. I have finally found a guy who puts all the HTML5 etc. on the

Simplicity! I'm in love. Thanks. Actually, your simple design is not the only one to make my day. I have finally found a guy who puts all the HTML5 etc. on the one page. He's a physics lecturer. He has dead easy html files that illustrate Newton's Cannon, using canvas and javascript. Finally, I am "getting" it. See http://physics.weber.edu/schroeder/html5/ http://physics.weber.edu/schroeder/html5/. (And the bonus was to see that, with uniform circular motion, the acceleration is towards the centre of rotation. I mean I really need things explained simply without any extras getting in the way.) Of course, I had to play with it to understand it. But the beauty was that, with the source code all there on the one page, I could easily make changes and see the effect immediately. Thanks Dan Schroeder. PS I need to remind myself that posting pdf files is another straightforward way to get information online.