Every doctor is known for their stethoscope, arguably the most important medical tool in history. But how does it work? Where ...

With one-fifth of states seeing active measles outbreaks, the U.S. is nearing 900 cases, according to the U.S. Centers for Disease Control and Prevention.

It was 1929, and Forssmann, just 25 years old, dared to ask a question that seemed absurd to his superiors: Could doctors ...