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What if our first line of immune defense, the innate immune system, could learn from past encounters to fight future battles more effectively? For decades, we believed this was the exclusive domain of adaptive immunity. But a groundbreaking concept is turning this dogma on its head, revealing a hidden layer of immune memory that could revolutionize medicine as we know it. Introduction For years, immunology textbooks have taught us that the innate immune system is a blunt, non-specific weapon, while the adaptive immune system, with its T and B cells, holds the key to long-term memory. This is why vaccines work and why we typically only get chickenpox once. However, a wave of recent research i …