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Princeton scientists used 3-D printing to create a "bionic ear" made up of a coil antenna and cartilage. (credit: Princeton Univ./Frank Wojciechowski)

University Researchers Create ‘Bionic Ear’

With a 3-D printer, a petri dish and some cells from a cow, researchers at one university are growing synthetic ears that can receive — and transmit — sound.

07/03/2013