A Princeton University professor is working on a bionic ear that would interface directly with a user's brain and enable humans to hear sounds that are currently far beyond their natural capacity, such as the sounds that bats hear. Michael McAlpine, who creates synthetic ears with live cells and conductive silver using a 3D bioprinter, says that in the future, having electronics embedded in the body will be common practice. "You won't think it's weird that a door will just open up as you walk towards it," he said. "We will become cyborgs, and it will be seen as just a normal thing."

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