This edition adds a new language, the Internet, that emerged between The Fifth Language (1995) and the 2000 iteration of The Sixth Language. Before sharing new insights into the nature and origins of language, Logan (Media Ecology Association, New York U.), recants his earlier nomination of virtual reality as a seventh language. He explores writing/speech and math/science as distinct language forms, implications of Web communication, and five ages of human communication. The book is dedicated to the memory of Marshall ("the medium is the message") McLuhan. Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)