A device implanted in a lab rat was able to power itself using oxygen and blood sugar.

In what's described as a medical first, National Geographic reports that a special glucose biofuel cell was able to generate electricity using the oxygen and blood sugar found in between cells. The device was successfully implanted and run inside a lab rat for eleven days.

Previous versions of glucose biofuel cells worked only in specific lab conditions and not inside living bodies. That's because the chemicals used required acidic conditions not typical of body fluids, as well as higher than normal glucose levels.

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