Downey, Tika

Provides an introduction to the history, economy, geography, and sights of Washington.

Examines the history, land and weather, sights, symbols, industries, cities, and other aspects of Texas, and includes a map and fact list.

A photographic introduction to Florida, discussing the history, natural features, industry, and landmarks of the Sunshine State.

Describes early counting systems--such as those of the ancient Egyptians and Babylonians--the first zero, and the use of the zero throughout history.

Provides an introduction to the history, economy, geography, and sights of New York.

Explores the value and importance of the number zero throughout history around the world. Discusses early counting systems and explains how the Babylonians were the first people to use a place-value system and to invent the concept of zero. Also examines Greek math, Hindu math advances, the Mayan number system, and how zero is used in the modern world.

Examines the history of the concept of variables through a discussion of the origins of algebra in ancient Arab civilization.

Provides an introduction to the history, economy, geography, and sights of Washington.