The quantum eraser experiment, a mind-bending twist on the double-slit experiment, challenges our intuition about reality, observation, and causality. It explores the mysterious interplay of quantum particles and their apparent ability to “decide” whether to act as particles or waves, depending on how we observe them. In the classic double-slit setup, a photon or electron passes through two slits, creating an interference pattern on a screen—a hallmark of wave behavior. But if we try to measure

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