to change them because the textbook as to not like competing with the used textbook dies. we do not an american math textbook is three times larger than an asian textbook. we read teach concepts many times poorly as opposed to teaching a modest number of concepts a few times. it is stunning but there would be this systemic difference. we have 50 states but they all fall into this trap. they all fell into the trap of committee-designed textbooks. and, the asians and did not fall into that trap. there is this common curriculum written about. there will be textbooks that will be on line and free. you still have a problem. you cannot assume everyone has an electronic key by and device. our foundation was involved in putting personal computers into every library. but, even that, that is not perfect universal access. in the next three or four years, some evolution of the netbook, or ipad, or phone will be adequate for engaging in that text book in an interactive way. the price