Apart from telling the time, your wristwatch may soon be able to tell who you are. The layout of blood vessels, tendons and muscles in the wrist is different for each of us -- and as good as a fingerprint for purposes of identification. These subcutaneous structures can easily be scanned using infrared light emitting diodes on the underside of a watch, says Joe Rice, inventor of the Veincheck technology, based in Mansfield, USA. The watch decodes the infrared image to create a bio-metric identification devise that could also act as a key to secure areas, says Rice. This could put an end to the hassle of using easily-lost smart cards.
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