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Right here and now, as an old friend used to say, we are in the fluid present, where clear-sightedness never guarantees perfect vision. Here: about two hundred feet, the height of a gliding eagle, above Wisconsin’s far western edge, where the vagaries of the Mississippi River declare a natural border. Now: an early Friday morning in mid-July a few years into both a new century and a new millennium, their wayward courses so hidden that a blind man has a better chance of seeing what lies ahead than you or I. Right here and now, the hour is just past six A.M., and the sun stands low in the cloudless eastern sky, a fat, confident...