In this context, quantum mechanics is a thorny theory because, unlike the rest of physics that deals in certainties, quantum mechanics deals in probabilities. We know that at some level quantum events must affect the state of the brain—after all, every photon detected (or not) by your retina is playing by the probabilistic rules of quantum mechanics. So even in theory it is probably impossible to predict human behavior with 100 percent accuracy. Nevertheless, quantum mechanics provides a form of probabilistic determinism: it establishes a domain of options and their respective probabilities,
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