Simple machines, such as the screw, are important to daily life. This title will help readers understand what a screw is, its parts, and how it makes work easier. This title is complete with… More →

Planes, trains, and automobiles are crucial forms of transportation today, but the first vehicles ever used date back 9,600 years ago! Society has come a long way from humans riding donkeys… More →

Describes the history of the Hoover Dam, why and how it was built, and how it works. Additional features include a table of contents, sidebars, infographics, Fast Facts, critical thinking… More →

Budding engineers love to know how things work, how to take them apart and put them back together, and why certain designs work better than others. In this book, presented by Scientific… More →

Discover the world of bulldozers with this engaging beginner-level book. Packed with eye-catching photographs, comic-inspired speech bubbles and humor, and fun facts translated into North… More →

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This title lets readers discover information about many kinds of farm equipment. Along with the development of tractors, readers will learn about major tractor brands as well as a variety of… More →

Tractors can get the job done. They help farmers every step of the way, from fertilizing fields to removing weeds to harvesting crops. This encyclopedia gives readers a look at tractors, from More →

What is it that makes tractors so fascinating to young children? It could be the sheer size of combine harvesters. It might be their ability to go off-road. Whatever the reason, this book… More →

Trains have been around for more than two centuries. They changed the entire world. This encyclopedia gives readers a look at trains, from the first steam-powered locomotive to high-tech… More →