In science fiction, invisibility cloaks let their users vanish from sight and sneak around unnoticed. How could one of these stealthy pieces of clothing work? Scientists have some ideas, which involve bending light. Discover the science and technology behind what it would take to make a real-life invisibility cloak!

This book describes the weapons that were used and invented during World War II, including tanks, planes, and the atomic bomb. In addition to historic photos, this book includes a table of contents, two infographics, critical thinking questions, two "A Closer Look" special features, a reading comprehension quiz, a glossary, additional resources, and an index. This Focus Readers title is at the Voyager level, aligned to reading levels of grades 5-6 and interest levels of grades 5-9.

This book describes the rise of anti-Semitism in Germany and the Nazi regime's systematic killing of six million Jews. In addition to historic photos, this book includes a table of contents, two infographics, critical thinking questions, two "A Closer Look" special features, a reading comprehension quiz, a glossary, additional resources, and an index. This Focus Readers title is at the Voyager level, aligned to reading levels of grades 5-6 and interest levels of grades 5-9.

After travelling millions of miles through space, roving robots gently landed on Mars and then drove across its surface. Read this book to learn how engineers accomplished these amazing feats of space exploration.

Many animals need to hunt other animals in order to eat. Hunting to Survive covers how animals wait for or seek out prey, as well as the different body parts that help them hunt.

This book describes the rise of anti-Semitism in Germany and the Nazi regime's systematic killing of six million Jews. In addition to historic photos, this book includes a table of contents, two infographics, critical thinking questions, two "A Closer Look" special features, a reading comprehension quiz, a glossary, additional resources, and an index. This Focus Readers title is at the Voyager level, aligned to reading levels of grades 5-6 and interest levels of grades 5-9.

Explores the many competitions that have pitted artificial intelligence against human intelligence, including in Go, chess, and Jeopardy! Clear text, vibrant photos, and helpful infographics make this book an accessible and engaging read.

Animals migrate for many reasons, including to find food and avoid extreme temperatures. Migrating to Survive covers how and why a variety of animals migrate by land, air, and sky.

This title examines the history and use of algae as a source of energy, the pros and cons of the technology, and next steps for this important energy source. This book also includes a table of contents, an infographic, informative sidebars, a That's Amazing special feature, quiz questions, a glossary, additional resources, and an index. This Focus Readers title is at the Navigator level, aligned to reading levels of grades 3-5 and interest levels of grades 4-7.

This title introduces readers to the region of Europe. Concise text, thought-provoking discussion questions, and compelling photos give the reader an insightful look into Europe's rich and complex histories, natural environments, economies, governments, and peoples.