 or dreamed up than we ever implement. So with that basic kind of building blocks about how search works, and I'd be happy to go into it in more detail, let me talk to you about how we've tried to meet this fake news challenge. I think the first thing I should say about fake news when it comes to search is in some ways it's a familiar challenge to us. Like other forms of spam, it's an attempt to game our algorithms to put low quality content into your results,