I think a person spends more time (more hrs of straight reading) with ebooks as well. I mean whether the book is 150 pages or 800 pages they all weight the same amount when beheld in an ereader device. While even something that weighs 8.5-8.7 ounces will cause the wrist to get weary after a time you can read longer in perfect comfort when you're reading off of an ereader like the Kindle rather than a pbook that could weigh in at several pounds depending on how many pages it is.
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