Cool but creepy

At the recent Greener Gadgets Design Competition, Jim Mielke demonstrated an interesting device: the “Digital Tattoo Interface” a subcutaneously implanted 2×4-inch touch-screen Bluetooth device powered by a coin-sized fuel cell that runs on blood (or more specifically, the glucose and oxygen carried by it). It uses a field-sensitive material in microscopic spheres, similar to tattoo ink, to change colors between clear and black to form the display. It also monitors the blood flowing through it for signs of various blood disorders, warning the person of health problems. As noted, it is still in the concept stage.

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