This guide starts with the earliest humans and the first tools, moving through the ages and ending up with the high-powered technology in use today. Along the way, young readers trace the development of items people now take for granted, such as medicine, computers and architecture. The "Your World Explained" series presents diverse subjects in an interactive manner that explains to young minds the way things work in the world. Everyday analogies are used where possible to untangle complex ideas so that each subject is made ...

Inventions Explained 1998, Marshall Editions, London

ISBN-13: 9781840281576

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Inventions Explained 1997, Henry Holt & Company, New York, NY

ISBN-13: 9780805048766

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Inventions Explained 1997, Marshall Editions, London

ISBN-13: 9781840280173

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