As some members have pointed out, this idea seems great for the reason that the article doesn't state: multimedia reading. Call it maps. Call it text in one page, graphs in the other. Call it making scientific literature quotations easily traceable. Or maybe studying literature, in which you can read a certain book analysis and the analysed book at the same time. Call it having the book in its original language in one side and a translation (in any language) in the other one. Dual screen books have their place.
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