Mechanical engineers Shervin Foroughi and Mohsen Habibi were painstakingly maneuvering a tiny ultrasound wand over a pool of liquid when they first saw an icicle shape emerge and solidify. […] Most commercial forms of 3-D printing involve extruding fluid materials—plastics, ceramics, metals or even biological compounds—through a nozzle and hardening them layer-by-layer to form computer-drafted Read more about Ultrasound Enables Remote 3-D Printing–Even in the Human Body[…]