Electronics often don’t mesh well with flesh and blood. Cochlear implants can irritate the scalp; pacemaker wires dislodge; VR headsets weigh heavily on the face. That’s why, for the past six years, Michael McAlpine has been Frankensteining alternatives. A mechanical engineer at the University of Minnesota, he creates prototypes of bionic body parts with nice, soft components—some of them alive.

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