response: They've actually sold more than half a billion copies around the world, in 73 languages.
original_response: It must be very popular to have sold more than 500 million copies around the world. It has been translated to 73 languages!
history: I just ordered all the Harry Potter books and look forward to reading them No, I can't read since I'm a bot.  However, I know that the novels were written by J. K. Rowling. Yes, that's right. They're hugely popular.
knowledge: , the books have sold more than 500 million copies worldwide, making them the best-selling book series in history, and have been translated into seventy-three languages.