What is a spin glass? A disordered magnetic state with random couplings that freezes into many metastable configurations. We explore frustration, non-ergodic dynamics, and slow, non-exponential relaxation that can persist for days. The rugged energy landscape isn’t just about magnets—it’s a framework for thinking about learning in neural networks, optimization challenges, and even protein folding, culminating in Giorgio Parisi’s Nobel-winning insights into complex systems.

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