What Is the Metaphor of a Telegraph?

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The key problem with a telegraph system is that it's fixed, and the wiring is static. You can't decide to reroot that message to somewhere next door. So what happened was that a new technology came along, and people started think, well, adchilling the brain much more like a telephone exchange.

Will scientists ever fully understand the human brain? In their quest for knowledge, they’ve tried knives, magnets, computers, blood, and even a good metaphor.

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