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It transformed a struggling teacher into one of Britain's most wealthy women and created a multimillion-pound publishing phenomenon.
But apart from making JK Rowling Scotland's richest woman, the teenage wizard she created has also persuaded millions of children to spend less time on computer games and televisions and more time with books.
New research by the Federation of Children's Book Groups (FCBG), shows that JK Rowling's storytelling has had a major impact on literacy and reading habits in the UK.