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RFID, chips are placed next to a human hair (that's running horizontally) for comparison in Tokyo, Tuesday, Feb. 6, 2007. Smart tags, or computer chips used for tracking items by relaying information wirelessly, are getting so tiny lately, the latest, billed as the world's smallest, is as invisible as a speck of dust. RFIDchips looks like powder, measuring just 0.05 millimeters (0.002 inches) by 0.05 millimeters (0.002 inches), and are thin enough to be embedded in pieces of paper, company spokesman said Thursday, Feb. 22, 2007.