Professor Jim Al-Khalili: "The double slit experiment is the central mystery of quantum mechanics"Fire individual atoms at a screen with two slits, one at a time. Each atom hits the screen as a localized particle. Yet over time they build an interference pattern as if each one went through both slits at once, behaving like a wave.When you add a detector to observe which slit each atom goes through, the interference vanishes and you get two simple bands like classical particles. Unplug the detect

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