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“Researchers at MIT have, for the very first time, successfully accessed a biological power source that has been known to exist for several decades. That source is located in the inner ear’s cochlea where it provides sufficient current to power an electrochemical signal that originates in the vibration of the eardrum. That mechanical force is converted to a signal that is sent to and processed by our brain.

The cochlea serves as a natural battery chamber filled with ions. There have been ideas to tap this “battery”, but scientists did not have a feasible concept to actually do so previously.”

http://www.tomshardware.co.uk/MIT-cochlea-inner-ear-power,news-41060.html#xtor=RSS-980

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