Making money online through Adsense and other ad networks

One very important observation I got when targeting a certain keyword is to use the keyword after an adsense block.

It seems that google has some perimeter algorithm that affects the ads shown by adsense.  I think it "senses" the words and phrases around the adsense ad block and factor that in determining the ads to be shown.

If you think about it,  people writing an article talks about many sub items in their article.  In fact every paragraph is supposed to talk  about a specific sub topic of the article.  This might be the reason why  google ads are affected by the words immediately near it.