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I've been a big fan of Paul Falstad's applets for a long time and particularly like his ripple tank. His home page has a picture of him with a small child (presumably his). The other day I was commenting in class about how this photo has always been on the site and was wondering how old the child is now. Anyway, as I flashed past the home page something caught my eye, iPhone / iPad and android apps. The ripple tank is now available for the iPhone, pity I haven't got one.