While I was visiting Fort Worth, Texas, recently, I walked into a used bookstore on North 8th Street—the kind of place where you can fall into a time warp, forgetting where you are until you hear the owner locking up for the day.
Two friends were driving to a conference at Kirkridge Retreat Center in Bangor, Pennsylvania. Since this is not the easiest place in the world to find, they had rented a car with a global positioning system. From the Philadelphia airport to the Kirkridge driveway, they were under the watchful eye of a satellite that tracked their every move.
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