To be clear, I'm not trying to sell Linux, and I don't care whether people use it or not. In fact, if gaining users means dumbing things down then I'm happy th

To be clear, I'm not trying to sell Linux, and I don't care whether people use it or not. In fact, if gaining users means dumbing things down then I'm happy they go elsewhere - it's probably best for everybody. I was specifically curious what the presenter meant between "run in" vs "run on top of". I've used Windows, OSX, and Linux, and I don't understand what he's getting at. Software runs "on top of" Linux just as much as it does on top of OSX and Windows.