Everyone knows what is feels like to be in pain. Scraped knees, toothaches, migraines, giving birth, cancer, heart attacks, and heartaches: pain permeates our entire lives. We also witness other people - loved ones - suffering, and we 'feel with' them. It is easy to assume this is the end of the story: 'pain-is-pain-is-pain', and that is all there is to say. But it is not. In fact, the way in which people respond to what they describe as 'painful'...