I believe you misread the article. The device allows you to read 20 books before you have to recharge it. The reader will probably be able to hold much more than 20 books. Therefore, the weight and space comparison with paper books begins at a single book.
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I believe you misread the article. The device allows you to read 20 books before you have to recharge it. The reader will probably be able to hold much more than 20 books. Therefore, the weight and space comparison with paper books begins at a single book.