Batteries made with melanin pigments that are naturally found in the skin, hair and eyes have been developed by a team at Carnegie Mellon University (CMU) in Pittsburgh, USA.

For decades, people have been envisioning that one day we would have edible electronic devices to diagnose or treat disease, said Christopher Bettinger, who worked on the battery.

If you want to take a device every day, you have to think about toxicity issues. That's when we have to think about biologically derived materials that could replace some of these things you might find in a RadioShack [battery].

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