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To be recognized as a National Bestseller, a book must sell at least 10,000 copies. Purchases made by the author and related companies are not included in awarding the National Bestseller status.
If you already have a copy of the What I Did Not Learn at IIT book, you do not need to buy the book again. There is no change to the actual content. More details about the book are available at http://www.iitbook.com