Susan Heinrichs Gray

Young children are naturally curious about animals. Tell Me Why Bears Hibernate offers answers to their most compelling questions about why bears sleep all winter. 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.

Looks at the dinosaur species Tyrannosaurus rex, with information on how they appeared, how they might have behaved, and how scientists know about them.

Simple, engaging text and bright photos introduce young readers to the origin, appearance, personality, and quirks of German Shepherd dogs.

"Young children are naturally curious about animals. Tell Me Why Zebras Have Stripes offers answers to their most compelling questions about the unusual pattern of this African animal. 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."--

This brief history of ophthalmology discusses the development of new techniques and introduces famous medical innovators.

Explains what geology is, shows how the Earth itself and rocks change, and looks at how geologists study the polar regions and outer space.

Briefly describes the climate, land formations, plant life, and animals of the frozen arctic land called tundra.

Presents general information about paleontologists, what they learn about prehistoric animals and vegetation by studying them.