Doctor With Stethoscope

Photograph by Jodi Cobb

Using well-trained listening skills, Charles Smith, an oncologist at Rappahannock General Hospital in Kilmarnock, Virginia, uses a stethoscope to hear the sounds in a cancer patient's chest. The highly sensitive—and versatile—instrument allows doctors to detect normal and abnormal sounds in such organs and vessels as the heart, lungs, arteries, and intestines.