If they showed videos like this when I was in school science class would have been much more interesting. This is the launch at 500fps and the guy explains what's going on. The power these things produce is just amazing. By the way Vimeo is 10x's greater than Youtube. If you get a chance check out some of the short films on there. I've been hooked on the site for a while now. Plus you can view it on your cell phone too.