For instance, a photo of the Croatian National Theatre links to a free article on the country's capital, Zagreb.

WSJ: Encyclopaedia Britannica Now Fits Into an App

The home page of the Britannica app features a large daily color photo with an accompanying free article related to the picture.

WSJ: Encyclopaedia Britannica Now Fits Into an App

The work, performed by researchers from the University of Pittsburgh, is reported in the latest issue of The Lancet (NOTE: fee to read full article, but free for the summary).

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