Invisible 'Radio' Tattoos Could Identify Soldiers

Somark Innovations announced biocompatible RFID (Radio Frequency Identification) ink, which can be used to tattoo cattle and laboratory rats and can be read through animal hair.

It might even be used on humans eventually.

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Bill Christensen catalogues the inventions, technology and ideas of science fiction writers at his website, Technovelgy. He is a contributor to Live Science.