Describes the physical characteristics, diet, natural habitat, and life cycle of these large wading birds, and tells about the efforts of scientists to establish resident flocks.
Traces the history of the underground transportation system in New York City, discussing the politics involved, how it was financed, the men who built it, and the construction techniques.
Describes the building of the Pantheon, discussing the role of the Roman emperor Hadrian and the significance of the Pantheon in the fields of history and architecture.
Describes the physical characteristics and behavior of seals and sea lions, how they differ from each other, how they relate to humans, how they have become endangered, and what is being done to protect them.
Acid rain recognizes no borders. Pollution created in one country can have devastating effects on the environment of another country. Humans have created acid rain, and humans have the ability to eliminate acid rain. Will countries cooperate in time to save our environment?
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