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The dispute is whether this is a genuine state of matter or a result of electrical noise and stray radiation that keep the electrons warmer than the thermometer.","posed_since":"","precise":"In $2\\mathrm{D}$ superconducting films and arrays (amorphous InOx, MoGe, Ta, transition-metal dichalcogenide superconductors, Josephson-junction arrays) tuned by $B$, gate or disorder near the superconductor-insulator transition, $\\rho(T)$ saturates below $T \\sim 0.1\\,T_c$ at $10^{-3}\\ \\text{to}\\ 10^{-1}$ of the normal-state value. Determine whether the saturation survives when electron temperature and external radiation are independently controlled (filtered leads, shielding, noise thermometry), i.e. whether $\\rho(T \\to 0) > 0$ holds in a finite parameter range.","problem_ref":"55870f737b0da9d54f7bed7c2935185e9c5207301dba5d762c5c10870a472abe","references":"","settled_by":"Measurements with calibrated electron thermometry and progressively improved radiation filtering in several material classes, showing whether the saturation disappears or stays unchanged.","status_note":"Radiation filtering removed the saturation in amorphous InOx and 2H-NbSe2 (Tamir et al., Science Advances 5, eaau3826, 2019), while other groups report saturation that persists with filtering in other films; no consensus as of 2026.","title":"Is the anomalous metal a true zero-temperature 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