In essence, the Copenhagen Interpretation says that a quantum entity does not have a certain property—any property—until it is measured. Which raises all kinds of questions about what constitutes a measurement. Does human intelligence have to be involved? Is the Moon there if nobody is looking at it? Does the Universe only exist because human beings are intelligent enough to notice it? Or does the interaction of a quantum entity with a detector count as a measurement? Or where, in between those extremes, do you find the boundary between the quantum world and the “classical” world of good old
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