This provides an opportunity for Voldemort to offer his own horrific version of order. As a side-effect Harry and Hermione, who were brought up in the highly regulated Muggle world, find solutions by thinking in ways unfamiliar to wizards. For example, Hermione notes that one obstacle to finding the Philosopher's Stone is a test of logic rather than magical power, and that most wizards have no chance of solving it. Nel suggested that the unflattering characterisation of the extremely conventional, status-conscious, materialistic Dursleys was Rowling's reaction to the family policies of the British government in the early 1990s, which treated the married heterosexual couple as the "preferred norm", while the author was a single mother. Harry's relationships with adult and juvenile wizards are based on affection and loyalty. This is reflected in his happiness whenever he is a temporary member of the Weasley family throughout the series, and in his treatment of first Rubeus Hagrid and later Remus Lupin and Sirius Black as father-figures. The second book, "Harry Potter and the Chamber of Secrets", was originally published in the UK on July 2, 1998 and later, in the US on June 2, 1999. "Harry Potter and the Prisoner of Azkaban" was then published a year later in the UK on July 8, 1999 and in the US on September 8, 1999. "Harry Potter and the Goblet of Fire" was published on 8 July 2000 at the same time by Bloomsbury and Scholastic. "Harry Potter and the Order of the Phoenix" is the longest book in the series at 766 pages in the UK version and 870 pages in the US version. It was published worldwide in English on June 21, 2003. "Harry Potter and the Half-Blood Prince" was published on July 16, 2005 and sold 11 million copies in the first 24 hours of its worldwide release. The seventh and final novel, "Harry Potter and the Deathly Hallows", was published on July 21, 2007. The book sold 11 million copies within 24 hours of its release: 2.7 million copies in the UK and 8.3 million in the US. An illustrated version of "Harry Potter and the Philosopher's Stone" was released on October 6, 2015, with illustrations by Jim Kay. The book carries over 100 illustrations and will be followed by illustrated versions of all seven books from the series by the same artist. In May 2020, a reading podcast by Spotify was created and entitled "Harry Potter at Home: Readings".