The Perth doctor who swallowed his hypothesis

In the early 1980s most doctors blamed peptic ulcers on stress. Barry Marshall drank a culture of the curved bacteria he and Robin Warren had found in stomach biopsies. A biopsy 10 days later showed gastritis, which then settled. The bug is now called Helicobacter pylori and causes most duodenal ulcers. Marshall and Warren shared the 2005 Nobel Prize.