And recently, we used to think that stomach ulcers were just caused by stress, until we discovered that H. pylori was the culprit.
अगदी अलीकडची गोष्ट. एच. पायलोरी या जिवाणूमुळे पोटाचा अल्सर होतो हे कळण्यापूर्वी तो केवळ मानसिक तणावामुळे होतो  असं समजलं जाई.