Screws are everywhere! From the cap on a bottle to a farmer's combine, screws help us lift, grip, squeeze, and move. Come inside the book to learn all about this fascinating simple machine. More →

Simple machines are all around children: bicycle wheels, doorstops, the seesaw on the playground. This captivating series from Crabtree opens young readers' eyes to the essential everyday… More →

Wedges are used to separate, lift, or hold things in place. One of humankind's most ancient tools, the wedge has a place in almost everyone's daily life. Learn more in this absorbing new title. More →

Read all about wheels and axles and their many uses in this new book. Children will be thrilled to learn of their many uses, from doorknobs to the insides of a clock. There are wheels that… More →

How does something enormous suddenly disappear? Readers will be amazed by how frequently large ships are lost without a trace. But sometimes it is just the crew that has disappeared. Get the… More →

Standing near the bank of the Nile River are the Pyramids of Giza. Built as royal tombs to honor three pharaohs of ancient Egypt, they are famous around the world--but much about them is… More →

Can you imagine life without light? Well, actually... it's impossible, because without light there would be no life on Earth at all! Learn all about the most disgusting and dreadful aspects… More →

People spend more time looking through glass than thinking about how it is made. Glass shows readers what it takes to make glass, as well as the part glass plays in our daily lives.… More →

Do you wonder about the planet we call home? Do you know the difference between climate and weather, why Earth's climate is warming, and how it affects plants and animals? In this book, learn More →

Slim explores the nutritional value of the grains group in this fascinating new book. Students will learn about the long history of grain cultivation, where grains are grown today, what types More →