> They use arxiv. Highly depends on the subject area. For mathematics almost 100% of new papers are on the arxiv. However, in biology or chemistry it is not ne

> They use arxiv. Highly depends on the subject area. For mathematics almost 100% of new papers are on the arxiv. However, in biology or chemistry it is not nearly as pervasive. One reason for that, besides history and culture, is given by exceptions in journals. Most journals demand exclusive copyright and that your article is not made available elsewhere, but all math journals include an exception for arxiv. That might not be the case in other scientific fields.