A North Carolina boy heard his father speak for the first time after a one-of-a-kind surgery.

Grayson Clamp was born deaf, but he is able to hear after doctors in Charlotte implanted a microchip into his brain to compute sound. Unlike a cochlear implant, which goes on the hearing nerve, Grayson's implant goes right on the brain stem.

The three-year-old boy is the first child in the United States to undergo this procedure. The implant still needs fine-tuning; Grayson received it as part of a Food and Drug Administration trial.

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