Floating Quantum Puck

Do you have a puck-sized disk of sapphire (coated, obviously, with yttrium barium copper oxide) gathering dust in the back of your junk drawer? If so, you're halfway to your own personal "quantum locked" maglev train. All you need is some liquid nitrogen and a magnetic track. Here's what your project will look like when you're done:



You can read about it at Discover Magazine, which also has links to some explanation of the physics.