Windows That Talk to You

It doesn't welcome you by name and tell you that "we still have those chinos in your size," as in the movie Minority Report, where talking billboards plug products to Tom Cruise's Detective John Anderton. But Whispering Windows, a new audio system from ETREMA Products, based in Ames, Iowa, at least sings to passersby, bringing us a little closer to that sci-fi future.

Using an amplifier connected to two small pucklike objects that stick to any smooth surface, Whispering Windows turns shopwindows and tabletops into speakers in milliseconds. Retailers can now play soothing music or sales pitches to lure you...

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