Portrait of a Killer: Jack the Ripper—Case Closed that a paper manufacture expert she hired asserts that reams of paper supposedly used by Jack the Ripper to write several letters to Scotland Yard and paper purchased by Sickert's mother bear the same small-press watermark. She also claims that there are matches in the cutter's marks, which are a result of the rough cutting of each quire (or small package) for packaging. A "quire" was usually of 24 sheets. Though Cornwell's book sold many copies, many Ripperologists and other critics argued that Cornwell's theory was far from persuasive. Critics also note that Cornwell has said that she did not
Google Sheets archival and organizational purposes. Launched for the entire Drive suite in September 2016, "Explore" enables additional functionality through machine learning. In Google Sheets, Explore enables users to ask questions, such as "How many units were sold on Black Friday?", and Explore will return the answer, without requiring formula knowledge from the user. In June 2017, Google expanded the Explore feature in Google Sheets to automatically build charts and visualize data, and again expanded it in December to feature machine learning capable of automatically creating pivot tables. In October 2016, Google announced the addition of "Action items" to Sheets. If a