"In-depth Articles" A New Powerful Google Search Feature

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Google has just rolled out a new feature called "in-depth articles" which, as its name indicates, allows users to delve deeper into the query they are searching. This new feature is all about providing searchers in Google.com ( English version to start with ) with richer and more challenging content than just the quick answers usually displayed in the first block of search results.

Google did not say anything about the algorithmic intricacies in which such " in-depth articles" are based but I am thinking that this feature also complies with Google ranking system. This is what Google said about it:
If you care about censorship, you'll find a thought-provoking article by Salman Rushdie in The New Yorker, a piece by our very own Eric Schmidt and Jared Cohen in the Guardian, and another great article about Iran. If you're in the mood for something lighter, search for [lego], you'll find great in-depth articles about many different facets of the topic from gender to engineering to art. For some more examples, check out new search results for population growth, capital punishment and e-waste.