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Google's uses the DART cookie so they can serve ads based on your previous visit website visits around the Internet.
Users may opt out of the use of the DART cookie by visiting the Google ad and content network privacy policy.
We use Google and Amazon advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you turn off the cookies in your browser, they won't be able to track you (I think) but then, but I don't worry about that stuff myself.