LED lights point shoppers in the right direction

Imagine that the products on the shelves of a supermarket could talk.  Not in a “Hi, how are you?” kind of way, but just enough to tell a central computer where they are in the store, so that the computer could tell shoppers where to go to find them.  That’s what a new system is supposed to do, using blinking overhead LEDs and low-power radio frequency tags on merchandise.

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