Scientists at Tel-Aviv University in Israel figured out "quantum levitation."  Basically, super-magnets and a frozen disc of special material are used and the frozen disk FLOATS in mid air. Seriously.  And not just that, the disc can be tilted and "locked" in any way.   You have to check it out. Escpecially if you are like me and are patiently waiting for the Back to the Future II  Hoverboards.