Part of the What's Inside series, this book looks at inventions. The book features an illustrated object alongside a cutaway version of the same object with easy-to-follow captions and annotation explaining the workings of each object. From bi-planes to bi-valves, the world of nature and science is peeled away before a child's eye. This book includes a look at the invention of locks, the sewing machine, the telephone, the flintlock pistol, radio, the flushing toilet, phonograph and the printing press.