Description acceptable. It’s not localization, but Skinner, Ruhman, and Nahum found that for a chain of randomly measured spin-½ particles with this property, entanglement entropy grows logarithmically. Perturbing a system with this property causes geometric rather than exponential decay to equilibrium, known as a namesake “slowing down.” The hypothesis (15[1])that neuronal networks have this property is supported by neuronal avalanches having a “scale-free-like” (*) power-law distributional scaling. Dynamical systems with an attractor that has this property have the “self-organized” form of it. Systems (10[1])in the same universality class have equal values of a set of exponents named for this property. Thermodynamic quantities are “reduced” by dividing by their value for a system with this property denoted by a subscript c. For 10 points, name this property of systems at a phase boundary. ■END■