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When you type in some search terms, Google uses synonyms as well to find matches. The results set is capped at 1000 hits. The ones shown have the highest page rank and authority. There is a also a lot of ad processing that goes on in tandem with the organic search results.
Filters are also applied to the results. Popular terms from today's news get a boost. Local issues of interest also get some priority. I tell you. This is all very interesting stuff to me. Thanks to the PPCBLOG for sharing the info.