The question is: What is the definition of “observation” (at here, it means particularly “collapse” to a definite quantum state)? Who said an observation, or collapsing, must be made by a physicist? What if my reader demands that the observation, or collapsing, must be made by the reader himself? On the other hand, there are billions of atoms and molecules in my body which are not observed, or collapsed, by any physicists. Are they not in existence (or not in a definite state) because they are not being observed, or collapsed, by a physicist, or anybody? There are billions of billions of atoms and molecules in the planet earth which are not being observed, or collapsed, by any physicists. Are they not in existence (or not in a definite state) because they are not being observed, or collapsed, by any physicist, or anybody?
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