To quote Google:

Leave me a comment if you would like to suggest search terms and I will vary them from time to time. The graph will give you an idea of the relative popularity of specific search terms.Google Trends analyzes a portion of Google web searches to compute how many searches have been done for the terms you enter, relative to the total number of searches done on Google over time. We then show you a graph with the results - our Search Volume Index graph.

That graph (waaay at the bottom of your blog) is pretty interesting. It looks like people search the term "genealogy" more often on weekends, since there is a spike on those days. It also appears that as a percentage of web searches, "genealogy" has steadily declined over 5 years. I hope this is because people have moved past basic searches into more specific searches? At least "Family History" held steady.

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