So there's the picture in a nutshell: each time we deeply practice a nine-iron swing or a guitar chord or a chess opening, we are slowly installing broadband in our circuitry. We are firing a signal that those tiny green tentacles sense; they react by reaching toward the nerve fibers. They grasp, they squish, and they make another wrap, thickening the sheath. They build a little more insulation along the wire, which adds a bit more bandwidth and precision to the skill circuit, which translates into an infinitesimal bit more skill and speed. Struggle is not optional—it's neurologically
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