J.K. Rowling reads to children at the 2010 White House Egg Roll. According to a new essay, her own experiences as a young student helped inform the Harry Potter character Dolores Umbridge. Chip Somodevilla/Getty Images hide caption

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Ginny Weasley and Harry Potter, played by Bonnie Wright and Daniel Radcliffe. Ginny grows up to write for The Daily Prophet, according to dispatches written by J.K. Rowling. Warner Bros. hide caption

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The cash-strapped U.S. Postal Service hopes its new Harry Potter stamps will spark enthusiasm among a new generation of stamp collectors. USPS hide caption

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Remember the frenzy when Harry Potter books and movies came out? Fans may be cast under a similar spell now that J.K. Rowling has agreed to write the screenplay for a Potter spinoff. (This 2005 photo was taken in London when the book Harry Potter and the Half-Blood Prince was released.) Paco Serinelli /AFP/Getty Images hide caption

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