While flying cars, human transporters and robots that clean your house remain a long way off, palm-scans to get into buildings, fingertip readings to log on to a computer, and voice-recognition applications as a form of identification are already here.Authentication technologies - those that verify that individuals are who they say they are - are starting to advance to near science-fiction levels, turning remote workplaces from Dragnet into Minority Report.

Well, almost.

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