Pennsylvania State University (PSU) researchers recently conducted a study of two major academic search engines to estimate the number of scholarly documents available on the Web. They calculated the number by studying the overlap in coverage of Google Scholar and Microsoft Academic Search. Google Scholar is a freely accessible Web search engine that indexes the full text of scholarly literature across an array of publishing formats and disciplines, while Microsoft Academic Search is a free public search engine for academic papers and literature. The researchers used statistical methods to estimate that at least 114 million English-language scholarly documents are accessible on the Web, of which at least 27 million are freely available since they do not require a subscription or payment of any kind. To read further, please visit http://news.psu.edu/story/329490/2014/10/09/research/how-many-scholarly-papers-are-web-least-114-million-professor-finds.