"MATERIALS: NIST on road to perpetual motion with 'superfluidity' demo"

Perpetual motion is forbidden by the laws of classical physics, but in the quantum realm frictionless motion is possible. For instance, a closed loop of superconducting wire can exhibit perpetual motion, albeit only for electrons traveling around the frictionless loop of wire. If only such frictionless motion could be demonstrated for a fluid, then "superfluidity" could realize the frictionless motion of atoms around a torus, thereby enabling ultra-sensitive rotational sensors to be built.
Text: http://www.eetimes.com/showArticle.jhtml?articleID=204301011