You're so veiny

As well as 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 person—and as good as a fingerprint for ID purposes. These subcutaneous structures can easily be scanned using infrared LEDs on the underside of a watch, says Joe Rice, inventor of the Veincheck technology, based in Mansfield. The watch decodes the infrared image to create a biometric identification device that could act as a key for secure areas,
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