Reference

Learn about the origins of our species and all things revolution in The History Book.Part of the fascinating Big Ideas series, this book tackles tricky topics and themes in a simple and easy to follow format. Learn about History in this overview...

The human body is amazing. Your blood makes up about 8% of your body weight. On average, your heart will beat more than 3 billion times in your lifetime! Doctors and scientists make choices every day about how to keep our bodies going. But what would you...

Vikings were fierce warriors who sailed the seas looking for new lands. They were expert sailors and shipbuilders. Find out the science behind their explorations, shipbuilding, and daily life. Discover how modern technology is being used to discover more...

Science can be weird. What's the purpose of snot? How do we taste flavors? Why do polar bears look white if their skin is black? In How the Heck Does That Work?! series, readers will explore the science behind how things work from plants to space to the...

The 2024 World Book Encyclopedia is the ultimate reference guide for learners of all ages. Meticulously curated by a team of expert editors, this comprehensive 22-volume set is packed with accurate, up-to-date information on a vast array of topics. From...

Dive into the world of humans with the Our Life encyclopedia! Early readers will learn about the human body, healthy living, hobbies, sports, jobs, careers, and more! Simple language is paired with colorful illustrations and photographs to help engage...

Dive into the world around you with the Earth and Nature encyclopedia! Early readers will learn about the planets in our solar system, Earth's continents, geographical features, and different biomes. Simple language is paired with colorful illustrations...

Dive into the inner lives of animals in the Animal Worlds encyclopedia! Early readers will learn about different animals and their homes, habits, and adaptations. Simple language is paired with colorful illustrations and photographs to help engage...

Science can be weird. What's the purpose of snot? How do we taste flavors? Why do polar bears look white if their skin is black? In How the Heck Does That Work?! series, readers will explore the science behind how things work from plants to space to the...