A Huge Collection of Harry Potter Facts Only Hardcore Fans Know

I love Harry Potter, but I wouldn't consider myself a superfan. Even so, I know a bit of trivia about the movies and books, but nowhere near the full 40 facts in this great Zimbio article. For example, did you know that of all magical abilities, J.K. Rowling would want the power of invisibility? Or that The Deathly Hallows was based on The Canterbury Tales by Geoffry Chaucer? If you think you know Harry Potter, you should absolutely check out the article and see how many of the trivia bits you already know.