There are a variety of disciplines included in JSTOR, from the social sciences to humanities to the natural sciences.
Not only can you browse by discipline, but also by individual journal title. Searching across the entire collection, or particular disciplines, is also available.
As a final note, JSTOR is a collection of scholarly journal literature. If you are looking for articles in magazines or "hot topics" discussed in the news, you should search one of the library's general databases.