Search engine optimization different signals. The leading search engines, Google, Bing, and Yahoo, do not disclose the algorithms they use to rank pages. Some SEO practitioners have studied different approaches to search engine optimization, and have shared their personal opinions. Patents related to search engines can provide information to better understand search engines. In 2005, Google began personalizing search results for each user. Depending on their history of previous searches, Google crafted results for logged in users. In 2007, Google announced a campaign against paid links that transfer PageRank. On June 15, 2009, Google disclosed that they had taken measures to mitigate the
The Metaphysical Engine, or What Quill Did titular character few favors." The Metaphysical Engine, or What Quill Did "The Metaphysical Engine, or What Quill Did" is the seventh episode of the British science fiction television series "Class". It was released online by BBC Three on 26 November 2016. The episode was written by series creator Patrick Ness and directed by Wayne Che Yip; it acts as a companion piece to the previous episode "Detained", also written by Ness and directed by Che Yip. "Class" follows four students of Coal Hill Academy and their alien teacher, as they deal with various alien threats. The episode takes place concurrently