Electron fluidics

Last month in Nature there was a paper claiming to have observed vortex motion in an electron fluid.  The abstract describes the observations (imaged using a SQUID, or superconducting quantum interference device) as "surface-induced para-hydrodynamics, which mimics many aspects of conventional hydrodynamics including vortices".  Earlier this week the finding was described in a Physics World article by Isabelle Dume, to whom I owe the hat/tip.