A research team at Harvard has created a remarkable proof of concept device: a thin, transparent speaker powered by ions instead of electricity. Such "ionic devices" could lead to artificial muscles, telescopic contact lenses, and more.
A thicker, stronger ionic device could replace a damaged muscle. A thinner, smaller one could be a contact lens that adjusts for distance or eye trouble. Another could be wrapped around a heart, ready to make up for weak or missed beats.
Transparent, flexible speaker runs on ions
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