Gray, Susan Heinrichs

Discusses the physical characteristics and habits of the bullfrog and its role as an invasive species in various parts of the world, covering their disruption of ecosystems and disturbances of people and native animals.

Discusses the origins and development of the use of hearing aids, the work of otologists and surgeons to develop new technologies, the contributions of Helen Keller, and the work of innovators such as Bartolomeo Eustachius, Adam Politzer, and Graeme Clark.

Presents a short study of the skin, and discusses the epidermis and dermis of the skin, how the skin separates the organs and tissues of the body from the environment,and other interesting facts about the skin.

Illustrations and easy-to-follow text describe the prehistoric predator velociraptor, discussing their habitat, hunting skills, and physical characteristics.

Describes what is known about the physical characteristics, behavior, habitat, and life cycle of this horned, plant-eating dinosaur.

Presents information on the prehistoric creature, plesiosaurs, and describes its size and physical characteristics, where it lived, a list of its different species and what scientists believe their daily life was like.

Explores the history of the American flag, looking at how it has changed over the years, providing information about the significance of the stars and stripes, and explaining how the flag should be displayed and honored.

Fluffy and feisty, Pomeranians have become one of the most popular dog breeds. Learn more about the "little dogs with the big spirit" inside.

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

Describes the characteristics, behaviors, and life cycles of Key deer, a species that lives only in the Florida Keys, explains some of the reasons why the animals became endangered, and discusses the efforts of the government, scientists, wildlife workers, and volunteers to protect and restore Key deer populations.