Nature (Editor: Philip Campbell) appears weekly and publishes papers from any area of science with great potential impact. The importance of Nature papers often extends well beyond the confines of the specific discipline concerned. (Nature's "impact factor", measured by the independent organization the Institute of Scientific Information in Philadelphia, is higher than any other interdisciplinary scientific journal.) Nature also publishes a broad range of informal material in the form of Opinion articles, News stories, Briefings and Recruitment features, and contributed material such as Correspondence; Commentary; News and Views; Scientific Correspondence; book, software and product reviews; Reviews; Progress articles; etc. See guide to authors for further explanation of these categories. Material can be submitted to London or Washington. Editorial staff in Tokyo, Munich and Paris can offer advice to authors, but material should not be submitted to these offices. The monthly journals publish papers of the highest quality and exceptionally impact in the disciplines indicated by their titles, as well as informal material and reviews, as elaborated below. All are based in New York except Nature Cell Biology which is based in London.