Digital textbooks gaining favor, but critics question quality

A textbook-free classroom is by no means the norm, but it may be someday. Slowly, but in increasing numbers, grade schools across the country are supplementing or substituting the heavy, expensive and indelible hardbound book with its lighter, cheaper and changeable cousin: the digital textbook. A digital textbook can be downloaded, projected and printed, and can range from simple text to a Web-based curriculum embedded with multimedia and links to Internet content.

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