QI and last up to two hours, although only 30 minutes of footage is used for normal episodes and 45 minutes for "XL" episodes. By 10:00 pm, recording has usually finished and the set has been disassembled. Roughly 16 questions are asked and about half of those make it into the show; 20% of material researched is used in a "QI" episode, while other facts may appear in the XL versions, a "QI" book, on "QI"s Twitter feed or on their website. The makers of the show insist that the answers are not given to the panellists beforehand. The host is
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