Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.

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Grade 4-7-- Concisely and clearly written, this is fascinating popular science. Each chapter begins with an historical or literary anecdote that lifts codes and secret writing from the world of fairy tales into real and exciting events. Sprinkled throughout the chapters on codes, ciphers, code machines, signals and sign language, invisible writing, and mind reading are other anecdotes that give historical perspective on this exciting science. Accurate and solidly written and researched, this title will offer hours of intellectual stimulation and, yes--fun! --Pamela K. Bomboy, Chesterfield County Pub . Schools, VA
Copyright 1990 Reed Business Information, Inc.

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