I study interacting quantum spin systems using nuclear magnetic resonance (NMR). Nuclear spins in hard, insulating, crystalline solids stand apart form all other quantum many-body systems as far better isolated from environmental degrees of freedom. Even at high temperatures where the system is far from its ground state, these systems retain fully-coherent quantum dynamics over long times. My lab uses methods of solid state NMR to study quantum thermalization and to look for signatures of quantum localization and other aspects of quantum dynamics in these systems.