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The question is whether spins and chiralities freeze at the same temperature or chiralities freeze first.","posed_since":"1992","precise":"For the 3D isotropic Heisenberg spin glass with nearest-neighbor Gaussian couplings, determine whether the chiral-glass transition temperature $T_{\\mathrm{CG}}$ equals the spin-glass transition temperature $T_{\\mathrm{SG}}$ in the thermodynamic limit; if $T_{\\mathrm{CG}} > T_{\\mathrm{SG}}$, give the ratio and the universality class of each transition. Answer: yes or no, with $T_{\\mathrm{CG}}/T_{\\mathrm{SG}}$.","problem_ref":null,"references":"","settled_by":"Equilibrium Monte Carlo on lattices large enough that finite-size crossings of spin and chiral correlation lengths converge to distinct or equal temperatures beyond statistical error.","status_note":"Simulations by the Kawamura group report $T_{\\mathrm{CG}}$ slightly above $T_{\\mathrm{SG}}$ (arXiv:1912.02502, 2019); other groups find a single transition within errors.","title":"Spin-chirality decoupling in the 3D Heisenberg spin 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