Dr Graham Easton presents the story of the stethoscope - medical icon, lifesaver, engineering challenge and doctor's best friend. Invented by a Frenchman named Lannaec in the early 19th century, the original design has barely altered. But digital technology is setto change all that. Plus, the chance to hear your body as you 've never heard it before: the gurgles of the gut, the "whoosh" of the heart and the roar of the lungs.
EMAIL: radioscience@bbc.co.uk Producer Rami Tzabar In sound health: page 40