Rapid responses are electronic letters to the editor. They enable our users to debate issues raised in articles published on thebmj.com. Although a selection of rapid responses will be included online and in print as readers' letters, their first appearance online means that they are published articles. If you need the url (web address) of an individual response, perhaps for citation purposes, simply click on the response headline and copy the url from the browser window. Letters are indexed in PubMed.
Most inventions are created just in the nick of time, thus proving that necessity is the mother of invention. Without the pressure of necessity, we don’t feel motivated to be creative in the first place. So we should try to accept, and even welcome, the pressure of necessity as a prerequisite to creativity and progress.