Text (and a few, adapted/simplified graphics) of an article in the May/June 2013 issue (Volume 41, No. 5) of Knowledge Quest, the journal of the American Association of School Librarians. I have included a few adapted /simplified graphics from the article, and I have added hyperlinks and an update/note or two. The original publication was sent to 7,000 school libraries and members of the American Association of School Librarians, and it is also available via several research databases. The article is published in Knowledge Quest as CC-BY