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Don't take my word, or the author's word, on such an important question. There are no easy answers. Research shows that as far as reading development goes, reading on a screen is no different from reading on paper. But are there other costs? And which is more important? One side of the argument is laid out very clearly in this article. You can continue the discussions in the comments below.
8 Ways Screens Are Ruining Your Family's Life, by Lori Leibovich, Huffington Post