Miracles and wonders: mobile edition

Eric Topol felt a twinge of nostalgia when he stopped carrying around his trusty stethoscope. It didn't last long. Stephanie Simon reports in The Wall Street Journal:
Dr. Topol, a cardiologist in San Diego, carries with him instead a portable ultrasound device roughly the size of a cellphone. When he puts it to a patient's chest, the device allows him to peer directly into the heart. The patient