Any eighth grader who has finished Introductory Geometry can tell you that the shortest distance between two points is a line, but any postal worker who has hauled a mailbag along a 10-kilometer route can tell you that figuring out the shortest distance between 400 or more addresses is nearly impossible. Software aimed at doing just that recently made its commercial debut, in Denmark, with the hope of shortening mail delivery times and slashing postal-service costs.

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