You may not pay much notice to product trackers like barcodes and RFID tags, but theyre absolutely vital in some fields; they cut back on bootlegging and help police determine the origins of bombs. Worcester Polytechnic Institute may have just delivered a major breakthrough, then, by developing nanoparticle barcodes. The minuscule tracers identify an object by producing a unique thermal signature (those colored lines you see in the photo) when they reach their melting point.
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