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
Opposite Worlds Opposite Worlds Opposite Worlds is an American reality game show that originally aired on the cable channel Syfy. The show premiered on January 21, 2014 and aired on Tuesdays and Wednesdays, with the latter being a live elimination episode. The format of the show is based on the successful Chilean series "Mundos Opuestos" which aired from 2012 to 2013 on the cable channel Canal 13. The series revolves around a group of strangers living in a house that is divided by a "future" and "past" theme. The contestants are divided into two teams, and compete in weekly challenges to determine