Impress your friends (and yourself) with just how much you know about Inventions! From the invention of the wheel to cars, phones, computers, plastics and millions of other inventions - these have all helped to shape our world. This book explores some of the key inventions throughout the ages and explains the ideas and technology behind them. Read this book to ensure you really do Know It All! Part of the series Know It All - there are eight books in this series covering everything from Cars and Pirates to Knights and Dangerous Animals.