"it was wizardry that transformed j.k. rowling from a destitute single mother on welfare into a best-selling billionaire. her adventures of teenage magician harry potter and his classmates at hogwarts became a children's literary sensation in 1998 with the u.s. publication of harry potter and the sorcerer's stone. it and the six subsequent books have now sold 375 million copies worldwide. the final one, harry potter and the deathly hallows, has sold 44 million since it was published last july, including 15 million in the first 24 hours."
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