response: Well, they're the best-selling book series ever, and they're now in 73 languages!
original_response: Yes it is the best selling book in history - in 73 languages!
history: Are you a Harry Potter fan? My younger daughter loved the books and movies. You mean the fantasy novel series by J. K. Rowling? I can't read, being a bot. I saw a few of the films and enjoyed them. Did Rowling write all the books? I don't know if she wrote them all, but they have sold over 400 million copies. Wow! I imagine she broke a lot of records with the series.
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.