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Google uses a search for Leonardo da Vinci as an example of searching for Renaissance painters. Google theorizes that many people could be looking up Renaissance painters in general but search on da Vinci since he is the most famous. Therefore, they give easy links to other painters of the time.
Here's a simple search for Gates. You've got your main choices of Bill (most likely since he's on the right), fences, or the Gates Corporation.
The ads are not completely gone. They just start below the search results on the right - and in the middle, of course.