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!

Odors can tell other animals to stay away or to come close. Getting Smelly to Survive covers how animals use smells to defend against predators, mark their territories, and attract mates.

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.

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.

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 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 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.

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.

This title examines the history and use of solar 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.

Explores plans for building a colony on Mars, focusing on its history, current developments, and potential for future discoveries. Clear text, vibrant photos, and helpful infographics make this book an accessible and engaging read. Plus, two "Scientist Bio" features highlight people who helped make this amazing technology possible.

Explores the history, events, and aftermath of Sophie Scholl's fight against Hitler's regime. Through insightful text, "In Their Own Words" special features, and critical thinking questions, this title will introduce readers to a historic example of social activism.

Explores plans for building a colony on Mars, focusing on its history, current developments, and potential for future discoveries. Clear text, vibrant photos, and helpful infographics make this book an accessible and engaging read. Plus, two "Scientist Bio" features highlight people who helped make this amazing technology possible.

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 examines the history and use of solar 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.

Explores methods and devices scientists use to explore the seafloor, focusing on their history, current developments, and potential for future discoveries. Clear text, vibrant photos, and helpful infographics make this book an accessible and engaging read. Plus, two "Scientist Bio" features highlight people who helped make this amazing technology possible.

Explores methods and devices scientists use to explore the seafloor, focusing on their history, current developments, and potential for future discoveries. Clear text, vibrant photos, and helpful infographics make this book an accessible and engaging read. Plus, two "Scientist Bio" features highlight people who helped make this amazing technology possible.