But then, why can’t you or I, ultimately composed as we are of quantum particles, be in two places at once, something that would certainly be extremely useful on a busy day? The answer on one level is very simple: the bigger and more massive a body is, the smaller will its wave-like nature be, and something the size and mass of a human, or indeed anything large enough to be visible with the naked eye, will have a quantum wavelength so tiny as to have no measurable effect. But more deeply, you can think of each atom in your body as being observed, or measured, by all the other atoms around it,
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