We know there are about 87 billion neurons in one human brain; but we do not how each of them are wired to all the others. Indeed, we don’t even know how one of them is wired to all the others. And sadly evolution did not helpfully label each neuron with a number. The scale of the puzzle is mind-blowing: 87 billion dots, and about 1 trillion lines to draw between them. By knowing the wiring, we may know all the routes by which information flows in, through, and out of the brain
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