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Explores the science of seasons, focusing on winter, discussing freezing and melting, the causes of cold weather, life in winter, and other topics; and includes a glossary, references, an index, and photographs.

Explains what a bulldozer can do, how its different parts work, and how the operator manipulates it from inside the cab.

Text and color photos present the physical characteristics, behavior, habitat, diet, life cycle, and conservation of jaguars; also includes a glossary and a bibliography.

Provides young readers with an illustrated introduction tothe physical characteristics, life cycles, and types of snakes; and includes a glossary, references, and an index.

Describes the causes and effects of the greenhouse effect and how it might be stopped.

Contains full-color photographs, illustrations, and maps that describe the history, geography, people, economy, and government of the state of Indiana; and includes charts, graphs, timelines, and classroom projects.

A simple introduction to different kinds of bulldozers and the work they do.

Briefly describes the way a helicopter operates, different kinds of choppers, what the pilot does, and some of the work for which helicopters are used.

A simple introduction to different kinds of motorcycles and how they are used.

Takes readers on a tour of Ohio, describing the state's history, culture, land, economy, government, and sights, and including unique facts, color maps and photos, the state song, suggested activities, lists of famous people, cultural institutions, and annual events, and other resources.

Takes readers on a tour of North Dakota, describing the state's history, culture, land, economy, government, and sights, and including unique facts, color maps and photos, the state song, suggested activities, lists of famous people, cultural institutions, and annual events, and other resources.

Presents a simple study on the physics of light and how light waves behave, and examines why stars twinkle, how telescopes and prisms work, and more.

Presents an introduction to DNA, in simple text with illustrations, explaining its vital role in the cells of every organism, and providing information on molecular life, the gentic code, RNA, proteins, and more.

Compares genes to blueprints for a home, explains how genes pass traits from generation to generation through heredity, and discusses the breeding of plants and animals for specific traits, the role of genes in disease, and ethical issues in genetic science.

Describes the various parts of the nervous system and explains how sensory messages are sent back and forth through nerves between the brain and the body.