SAN JOSE, Calif.--I'm staring at a table covered in circuitry, a solderless "breadboard," a bunch of wire, an antenna, and some other components--all the things I've been given to build a rudimentary ...
In 1974, two Drexel University students found that an oscillating mirror laser could scan and read barcodes, their solution for more efficient grocery store management. Quick-response codes, or QR ...
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