By using ultra-fine polymer fibers, military researchers have been able to regrow damaged or missing organs and limbs. They will announce their findings officially next month at the 26th Army Science Conference in Florida . One example given by John Parmentola , a director of research and lab management, involved a man who lost the entire tip of his finger while starting up a model airplane. "That has been completely regrown . . . the nail, the bone, the tissue," he said.