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USA Today reports that "...The possibilities of smart maps are endless....These maps exist. They're the product of geographic information systems, or GIS - sophisticated computer programs that link information in databases to a map. Click on any point or line, and as much information as the system knows pops up -- the address, crop yield, tax assessment or even vaccination level, all of which can be shown visually. GIS lets users compare apples and oranges by comparing seemingly unrelated data to see whether there's a pattern...."

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