The difficulty of linking external reality to consensus reality reached a new record high with the discovery of quantum mechanics, manifested in the fact that we physicists still argue about how to interpret the theory today, about a century after its inception. As we saw in Chapter 8, the external reality is described by a Hilbert space where a wavefunction changes deterministically over time, whereas the consensus reality is one where things happen seemingly at random, with probability distributions that can be computed to great accuracy from the wavefunction. It took over thirty years from
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