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Coming from a background in neuroscience, IMO, neurons are extremely complicated. There's tons of molecular machinery beyond their inputs and outputs (which in and of themselves are complicated). They are complicated enough that neuroscience has been a field for sometime now, and we still only know very little about the human brain. That's even if we are just talking about a single neuron, ignoring the enormous numbers of neurons and glial cells we have, all interconnected.

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