Brian in Rochester, Michigan, asks, how do we use his location?

And previous searches affect current and future search results?

Well, let's talk about when you're logged in, because that's a much easier case to talk about.

If we know where you're located, whether you're using a mobile phone or whether you're using a web browser, we can return you better results.

If you're typing pizza or yoga instructor or plumber, you'd much rather see the ones that are close by than something that's located in San Francisco.

If you're in New York or vice versa.

So we absolutely do try to use your location even down to the city level, to try to say, oh, this person is in this city.

Let's try to show them relevant, useful results from nearby previous searches.

In the same way we've been very clear.

If you sign in, we try to personalize your search results, and that can be very helpful, because if you know that ATM is a networking protocol in addition to a cash machine, maybe you're more interested in the Asynchronous transmission protocol sort of stuff.

So the more information you're willing to give to Google, the better and more relevant search results we can give back to you.

Now, if you want to clear your cookies, you're more than welcome to.

And in that case, we don't know anything about you.

Maybe your IP address can tell us a little where we're guessing your country and those sorts of things.

But most people, the vast majority of people seem to say and be okay with the idea that OK, if I'm willing to tell Google a little bit of information, the quality of the search results can be better for me.