within the vast metropolis of the brain, myelin quietly transforms narrow alleys into broad, lightning-fast superhighways. Neural traffic that once trundled along at two miles an hour can, with myelin's help, accelerate to two hundred miles an hour. The refractory time (the wait required between one signal and the next) decreases by a factor of 30. The increased speed and decreased refractory time combine to boost overall information-processing capability by 3,000 times—broadband indeed.
