The ability to alter the contents of a book will be easy to abuse.

WSJ: Nicholas Carr on E-Books

That button also lets you buy the book (in the case of a sample), skip to a specific page, bookmark, look up a word in the including Collins dictionary, view the book's table of contents, and adjust the font size -- there are eight font sizes in all.

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Readers would normally look up a question of interest in the Table of Contents and then proceed to read that self-coaching answer in the book.

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