Textbooks existed forever because the technology to replace them did not exist up until the time Apple invented iPad. Text books get out dated by the time they get printed. Then, by the time they get distributed to schools, they are more than outdated and less than useful. eBooks are cost-effective and cheaper compared to textbooks - even if we consider the initial cost of investment in a tablet. Many schools across the country (TN, GA, NJ, IL, etc) are replacing textbooks with iPads - good for...