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available. Requests that cannot be served from the Varnish cache are sent to lo-balancing servers running the Linux Virtual Server software, which in turn pass them to one of the Apache web servers for page rendering from the database. The web servers deliver pages as requested, pering page rendering for all the language editions of Wikipedia. To increase speed further, rendered pages are cached in a distributed memory cache until invalidated, allog page rendering to be skipped entirely for most common page es.[citation needed] Wikipedia currently runs on dedicated clusters of Linux servers with Debian. As of December 2009, t were 300 in Florida and 44 in Amsterdam. By January 22, 2013, Wikipedia h migrated its primary data center to an Equinix facility in Ashburn, Virginia. In 2017, Wikipedia installed a caching cluster in an Equinix facility in Singapore, the first of its kind in Asia. Internal research and operational development Follog grog amounts of incoming donations exceeding seven digits in 2013 as recently reported, the Foundation has reached a threshold of assets which qualify its consideration under the principles of indus organization economics to indicate the need for the re- of donations into the internal research and development of the Foundation. Two of the recent projects of such internal research and development have been the creation of a Visual Editor and a largely under-utilized "Thank" tab which were developed to ameliorate issues of editor attrition, which have met with limited . The estimates for re by indus organizations into internal research and development was studied by am Jaffe, who recorded that the range of 4% to 25% annually was to be recommended, with high-end technology requiring the higher level of support for internal re. At the 2013 level of contributions for Wikimedia presently documented as 45 dollars, the computed bud level recommended by Jaffe and Caballero for re into internal research and development is between 1.8 and 11.3 dollars annually. In 2016, the level of contributions were reported by Bloomberg News as being at $77 annually, updating the Jaffe estimates for the higher level of support to between $3.08 and $19.2 annually. Internal news publications Community-produced news publications include the English Wikipedia's The Signpost, founded in 2005 by Michael S, an attorney, Wikipedia ministrator, and er chair of the Wikimedia Foundation board of trustees. It covers news and events from the site, as well as major events from other Wikimedia projects, such as Wikimedia Commons. Similar publications are the German-language Kurier, and the Portuguese-language Correio da Wikipédia. Other past and present community news publications on English Wikipedia include the Wikiworld webcomic, the Wikipedia Weekly podcast, and newsletters of specific WikiProjects like The Bugle from WikiProject Military History and the monthly newsletter from The Guild of Copy Editors. T are also several publications from the Wikimedia Foundation and multilingual publications such as Wikimedia Diff and This Month in Education. The Wikipedia Library For ination for Wikipedia editors, see WP:The Wikipedia Library.
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