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PETRI — a society grown in a digital dish. In 1968, John Calhoun built mice a closed utopian habitat — unlimited food, zero predators — and watched crowding trigger social collapse in his famous Universe 25 experiment. PETRI takes that concept into an in-silico Petri dish: a bounded digital medium where synthetic organisms with distinct personality traits propagate, compete, and evolve emergent social physics in real time.