Dilute magnetic materials that are both random and “frustrated” possess a remarkable “spin glass” phase.  Though the materials are quite disordered, and exhibit a rather dull phase diagram, there exists an internal “ultrametric” order that has startling consequences. ...

In the early 1950’s Purcell and Ramsey hypothesized that the electron might have an CP-violating electric dipole moment proportional to its spin.  This hypothesis set in motion a hunt for the electron’s electric dipole moment (e-EDM) that is still ongoing.  The value of such an e-EDM divided...