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
What Is Mathematics? Expectations" by Charles Dickens. According to Constance Reid, Courant finalized the title after a conversation with Thomas Mann. What Is Mathematics? What Is Mathematics? is a mathematics book written by Richard Courant and Herbert Robbins, published in England by Oxford University Press. It is an introduction to mathematics, intended both for the mathematics student and for the general public. First published in 1941, it discusses number theory, geometry, topology and calculus. A second edition was published in 1996 with an additional chapter on recent progress in mathematics, written by Ian Stewart. The book was based on Courant's course material. Although