When classes begin next fall, dental students at seven higher education institutions across the country will buy four years' worth of textbooks and manuals on one digital video disk (DVD). Soon, developers say, students in elementary and secondary schools also will be able to use individual DVDs to access all their curriculum materials.

From slides to movie segments to handouts, the dental school DVDs will house all the course materials students will use throughout their program. To keep the disks up-to-date, they will be replaced every six months.

The idea of an all-inclusive DVD is not


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