A projection system in a classroom with an Internet connection provides a window on the world. Until recently, projectors were expensive and difficult to maintain. Technological advances have resulted in solid-state projectors that require little maintenance and cost no more than a computer. Adding a second or third computer to a classroom…

In higher education, the number of computer projectors in classrooms has doubled every year for the past five years. A similar trend in K?12 education is occurring now that capable classroom projectors have become available for less than $1,000. At the same time, large-screen displays are becoming common in society; a trend being acceleration by a…