The Book of General Ignorance was released in the UK a year after "The Book of General Ignorance", on 4 October 2007. An audiobook adaptation called "The Sound of General Ignorance" was scripted and read by the authors on 4 November 2008. On 25 December 2008 an extended version of the book, entitled "The Noticeably Stouter Edition", was published to coincide with "QI" moving to BBC One. This new version included new facts, quotes from the show, a list of all the episodes made at the time, an index, and a new collection of "Four words" from Davies. On 1 November 2007 another "QI" spin-off
The Mystery of the Sphinx Channel over the next decade. "Mystery" was initially released by Goldhil Home Media as a 95 minute "extended version" on VHS in 1994, and re-released on DVD by UFOTV as a 95 minute "Special Edition" in 2005. The VHS release was described in a 1994 review as "a fascinating combination of science and humbug." Robert M. Schoch criticized the extended version of the documentary, saying "Unfortunately, the original documentary has since been re-edited and expanded with all sorts of extraneous material, some of which I am not at all happy about, and is currently being marketed by 'UFO TV'. It