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The ambient-pressure record is 151 K in pressure-quenched HgBa2Ca2Cu3O8+d (2026). An answer is a reproduced zero-resistance and Meissner measurement above 300 K at 1 bar, or a proof that a defined class of realistic materials cannot exceed a stated $T_c$ below 300 K.","problem_ref":null,"references":"","settled_by":"Independent replication of resistive and magnetic transitions above 300 K at ambient pressure.","status_note":"Pressure quench of $\\mathrm{HgBa2Ca2Cu3O8}+d$ raised the ambient-pressure record from $133\\,\\mathrm{K}$ to $151\\,\\mathrm{K}$ (2026); claims of room-temperature superconductivity in nitrogen-doped lutetium hydride (2023) and LK-99 (2023) were not reproduced.","title":"Can any material superconduct at room temperature and ambient 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