 using signals algorithmically at scale to try to answer the question, which in some ways is the same answer to your question, ma'am, about how do we know whether or not the content we show to one individual is useful or relevant to somebody else. I'd say the most useful signal about knowing what's relevant and useful to your query are the words that are in that query. That's the strongest signal to our search algorithms, the words themselves. And then we build on that using our tools to try to provide you the most relevant and useful information.