Soft tissue moves, stretches and slides the moment a surgeon cuts it, which is exactly why handing a scalpel to a machine is so hard. A Johns Hopkins team now reports a robot that kept track of those changes and removed tumors from eight lab-made kidneys, making 77 cuts without a single error. The result, announced by the Department of Mechanical Engineering on November 9, 2026, is a research milestone in a controlled setting. The kidneys were synthetic gel models, not patients, and the wor...