Lions and bees and meerkats, oh my—these are a few of the many animals that survive and thrive in groups. Discover how group members help each other face life’s challenges. From finding food to raisin
Learn how the American Revolution tore apart communities and turned British colonists to Americans. Includes a glossary, websites, and other resources.
"Hydrogen is the most widespread element and one of the building blocks of life. First appearing when the Big Bang created the universe, hydrogen is now part of human technologies that could change th
Explores the establishment of the judicial branch. Authoritative text, colorful illustrations, illuminating sidebars, and a "Voices from the Past" feature make this book an exciting and informative re
After traveling 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
Wildlife crossings help keep animals safe from the roads that cross their natural habitats. Read this book to discover how engineers create these structures that protect animals.
