Abstract
Human beings need communication. During the development of mankind, a multitude of communication technologies have been invented and used. Some of them had a dramatic impact on society in general and on the way scientific knowledge was disseminated. In this article we discuss some of the effects of each of these changes to teaching as a way of disseminating scientific knowledge. We discuss some of the potential effects caused by the new revolution of communication due to the World Wide Web and the potential of ubiquitous computing. We discuss the evolution of communication technology followed by a discussion of the achievements of each technology. Next, the effects of these achievements on teaching are discussed. Finally, we set these considerations into a broader context and discuss the effects on two important parameters: lead time of the teacher and verifiability of the teacher's claims.