The following is a partial list of scientific journals. There are thousands of scientific journals in publication, and many more have been published at various points in the past. The list given here is far from exhaustive, only containing some of the most influential, currently publishing journals in each field. As a rule of thumb, each field should be represented by fewer than ten positions, chosen by their impact factors and other ratings. For periodicals in the social sciences and humanities, see list of social science journals.