I can see somewhat of an application if it's a textbook and say if it is math and you want to go back and forth..I'm just not exactly sure how that would work here.
I think kindle is improving things and there is still a way to go. The number of font sizes is one thing and I think that there will be an outright font selection.
Maybe a future os could make it so that it divides a page up but I'm not sure how much that would affect the time to read the book. ...way back in the day I had a cybiko that tried to do ebooks...it simply flashed a word a second and expect you to read it..didn't work well.
I guess simply formatting the text to be two pages could be ok but it would be dividing current pages up. Technically you can have columns if you read pdf's..
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