"Machines have about as much warmth as a cube of ice. And that is why the horse is still part of our lives and will live on. He was here millions of years before man came upon the earth, and if the cycle is completed, he may still be thundering across the world long after man has vanished."

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What we found was that rather than being haphazardly arranged or independent pathways, we find that all of the pathways of the brain taken together fit together in a single exceedingly simple structure. They basically look like a cube. They basically run in three perpendicular directions, and in each one of those three directions the pathways are highly parallel to each other and arranged in arrays. So, instead of independent spaghettis, we see that the connectivity of the brain is, in a sense, a single coherent structure.

— Ray Kurzweil