 Interest in post-colonial literature, gay and lesbian literature, writing by people of color, working people's writing, and the cultural productions of other historically marginalized groups has resulted in a whole-scale expansion of what is considered "literature," and genres hitherto not regarded as "literary," (such as children's writing, journals, letters, and travel writing, among many others) are now the subjects of scholarly interest.Most genres and sub-genres has undergone a similar analysis, so that one now sees work on the "female gothic" or women's science fiction, for example.In Robert Silverberg's introduction to James Tiptree Jr.’s "The Girl Who Was Plugged In," he expressed the sentiment that the pseudonym must belong to a man, as the syntax and lexicon used in the short story were undeniably masculine.