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On my husband's computer, he has ads for fire and EMS shirts, EMT education, Bangor real estate, and Bangor hotels. He has a second computer on his desk, and gets the same results on both of them.
The difference can't be geograpical, since he's no more than 5 feet from me.
Or did you view other Civil war pages previously to loading that one, while your husband went to that page after viewing the EMS pages? Perhaps the ads "followed" each of you as you went to that specific page you are referring to. That might also contribute how it decides what ads to display.