1. Conventional books grow old; these books gets periodic updates for free on the internet.
  2. Conventional books are expensive; to get both 'Introduction to Biochemical Engineering' and 'Unit Operations in Environmental Engineering' together on one flash drive as a gift, send a tax-free donation of $20 to this department
  3. Pages in a conventional book are static; these books have pages that interact with the reader.
  4. Other e-books have few if any links to the internet.
  5. Have found no other book designed for editing and supplementing (Readers get instruction pages and templates).
  6. Most of its 4 gigabyte flash drive is free for adding new material.

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