The world of fiction has always been a little bit less than rigid when it comes to distinguishing categories of books for non-adults. Once there was only fiction for children and fiction for adults. And even this was a bit bewildering. Little Women , for example, was considered a work for children, but the length and some of the themes are more fit for adults. I would argue that one of my favorite children's books, Alice in Wonderland , is strictly for adults. What child could appreciate Lewis Carrol's trippy imagery or sharp humor? In more modern times we have had children's books, which included picture books and slightly longer books with chapters ( Ramona the Pest ) and young adult books ( Jacob Have I Loved ) with YA being a genre targeted toward teens. Then YA absolutely exploded,, and plenty of adults started reading these too. I know many fully adult readers, including myself, who find young adult fiction as mesmerizing as work created for adults. The YA label use...