Did you know that people with rakes used to do the work of garbage trucks? Or that porta-potties were put on ships to keep workers from running to shore for bathroom breaks? Get ready to learn the odd stories behind inventions you use every day. From the T.P. of Chinese emperors to the landfills of ancient Greece, you'll find out how we got the sanitation inventions that keep us healthy and keep the world smelling fresh.

Young children are naturally curious about animals. Spiders Weave Webs offers answers to their most compelling questions about why spider webs. Age-appropriate explanations and appealing photos encourage readers to continue their quest for knowledge. Additional text features and search tools, including a glossary and an index, help students locate information and learn new words.

Using the new Next Generation Science Standards (NGSS), the My World of Science series provides the earliest readers with background on key STEM concepts. Sound Waves explores the creation and motion of sound waves in a simple, engaging way that will help readers develop word recognition and reading skills. Includes a glossary and index. Simple sentence structure and word usage help readers develop word recognition and reading skills. Includes a glossary...

Young children are naturally curious about exotic animals. Tell Me Why Elephants Have Trunks offers answers to their most compelling questions about this large animal that uses its trunk to eat and drink. Age-appropriate explanations and appealing photos encourage readers to continue their quest for knowledge. Additional text features and search tools, including a glossary and an index, help students locate information and learn new words.

Readers learn how this simple machine makes it easier to split things apart or stop them from moving. They learn how thicker wedges need more force to split something apart than thinner wedges. By the end of the book, readers know the difference between complex and simple machines and how wedges are used in everyday life to make work easier. How can we lift and lower things? How can we move heavy loads from one place to another? By using simple machines!...

Readers learn how this simple machine makes it easier to move things to different levels. They learn how flatter slopes use less effort than steeper slopes. By the end of the book, readers know the difference between complex and simple machines and how inclined planes are used in everyday life to make lifting and lowering objects easier. How can we lift and lower things? How can we move heavy loads from one place to another? By using simple machines!...

Using the new Next Generation Science Standards (NGSS), the My World of Science series provides the earliest readers with background on key STEM concepts. Earth's Path explores Earth's journey around the Sun in a simple, engaging way that will help readers develop word recognition and reading skills. Includes a glossary and index. Simple sentence structure and word usage help readers develop word recognition and reading skills. Includes a glossary...

How Do We Live Together: Hawks, opens young eyes to the bustling world around them and gently encourages early learning. Boys and girls will see how hawks care for their young, and find out where they live, what they eat and how they behave. Readers are encouraged to think critically about how we share our backyards with these wonderful birds.

Explains what life cycles are and how plants and animals grow; describes the scientific method; and includes experiments testing different life cycle concepts. This series makes the scientific process lots of fun! Clear, step-by-step instructions let readers explore the world of science through well-crafted, hands-on experiments. Colorful photos, lively and informative illustrations, and easy-to-read text make the topics appealing and accessible to...