Each book in this new series follows a major technological innovation from its first appearance in human history to its present-day development. The intuitive layout of each book underscores the remarkable history that is surveyed. Running text on the upper third of each page provides a concise narrative, while a continuous timeline on the bottom two-thirds of the page records the highlights and curious facts of the development of the technology. Text and timeline together provide the kind of challenging and multi-format reading experience recommended for 3rd-through-5th-graders in today’s standards-based curriculums.