International Standard Book Number in 1965, has – 340 indicating the publisher, 01381 their serial number, and 8 being the check digit. This can be converted to ; the check digit does not need to be re-calculated. Since 1 January 2007, ISBNs have contained 13 digits, a format that is compatible with "Bookland" European Article Number EAN-13s. An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January
What Lies Below "steady but stagnant ratings", as they were "not much different" from the previous week. "What Lies Below" received mixed reviews from television critics. "The A.V. Club" contributor Todd VanDerWerff graded the episode with a B-, explaining that despite some nice moments, it was "an episode of the show that started out utterly predictably, continued along an utterly predictable path and yet somehow got fairly enjoyable by the end just through sheer force of will on the part of the cast." IGN's Ramsey Isler also found the episode average and predictable, as it lacked "much of the quintessential storytelling elements that,