The science of Avatar

Maybe you saw Avatar (I still haven't - I'm not sure I will), or maybe you have no idea what it is (James Cameron's latest movie, which, I believe, became the highest grossing movie of all-time last weekend). But apparently, the "world" in which the movie is set has floating mountains and other sci-fi wonders. But are things like that really possible?

Below is a video from WGN TV in Chicago. They interviewed Notre Dame's Morten Eskildsen of the Physics Department. Professor Eskildsen conducts research on superconductors (or, for non-science people like me, "electric stuff that floats with liquid nitrogen"). I think all of this would be pretty interesting - if I understood the scientific jargon!