More In-Depth Articles in Google Search

For general queries like [global warming], [love], [Mandela], [China], Google shows some in-depth news articles at the bottom of the first page of results. Until now, Google only included 3 articles, but this has changed: you can click "more in-depth articles" and get 5 more articles.

Google also added some related queries you can explore to find other related articles. Clicking the "explore" links sends you to a page that places in-depth articles at the top, but also shows regular search results. Google adds &ida_m=1 to the search URL.

{ Thanks, Rubén. }

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Source: http://googlesystem.blogspot.com/2013/12/more-in-depth-articles-in-google-search.html