  It is suggested that the observations of nonlinear susceptibility and Nernst
effect in cuprate superconductors above Tc, and those of non-classical
rotational inertia in solid He, are two manifestations of a state of matter we
call a vortex liquid, distinct from a conventional liquid in that its
properties are dominated by conserved supercurrents flowing around a thermally
fluctuating tangle of vortices.
