A stomach ulcer is a sore that forms on the lining of the stomach or duodenum (the first part of the small intestine). It is usually caused by the bacterium Helicobacter pylori or the use of non-steroidal anti-inflammatory drugs (NSAIDs). Symptoms may include abdominal pain, bloating, nausea, vomiting, and...

When Facebook opened its desktop site to third-party sellers, it seemed like a win-win for users and businesses. Users would have more options when buying things, while businesses could expand their reach. But in practice, the rollout has been rocky. With this many people using Facebook on mobile devices and...