Recently, I have noticed that I have started receiving ads online for products that I have only discussed in normal conversation. Both times, these ads were for specifically discussed products and both were within hours of discussing them. One was a very specific and lesser known beverage I hadn't even heard of before, after a conversation between my wife and I while we were in the grocery store. The other was for flour after talking with my wife about needing flour for homemade pizza. I can't find any specific apps on my phone with permissions for location or microphone. I can only assume that it is Google that is "listening", as I have an Android phone. How can I tighten the restrictions that Google can see?