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Candidates include quantum tunneling of magnetic vortices and superconducting islands coupled through normal metal.","posed_since":"","precise":"Given an intrinsic saturated resistance $\\rho_0 \\ll h/e^{2}$ near the 2D superconductor-insulator transition, identify the dissipation mechanism: quantum vortex creep or vortex liquid, a Bose metal of uncondensed Cooper pairs, superconducting puddles coupled through a dissipative bath (failed superconductor), or a quantum Griffiths regime. An answer predicts $\\rho_0(B)$, the reported vanishing Hall resistance (Breznay and Kapitulnik 2017), the $h/2e$ magnetoresistance oscillations seen in patterned films (Yang et al. 2019), and the noise spectrum.","problem_ref":null,"references":"","settled_by":"A theory predicting $\\rho_0(B)$, the Hall response and $h/2e$ oscillations, confirmed quantitatively in one controlled system.","status_note":"","title":"What dissipates current in an anomalous metal at low 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