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While Alexander Graham Bell won the race to patent the telephone, he was only one among many inventors who explored instant voice communication. This fascinating book describes the evolution of the telephone from the invention of the telegraph by Marconi to the modern day cell phones that have become a popular part of our everyday life. It also takes a close up look at how the telephone works, early inventors, those who continue to enhance the technology, and telephone companies, their products, and competition.Describes why and how the telephone was invented, how the telephone system was developed, and how the telephone has been physically improved since its invention.

From its arctic north to its tropical south, North America is home to many different landscapes, plantsand animals, natural resources, climates, and cultures. Learn more in North America, an Exploring OurSeven Continents book.

From tropical rainforests to frozen glaciers, South America has some of the most varied landscapes on Earth.Brazil is South America’s largest country in both area and population. Learn more about the natural resources,tourism, and culture in South America, an Exploring Our Seven Continents book.

The Empire State Building in New York City is one of the world’s most visited buildings. The tall office building was built in 1931, during a period known as the Great Depression. Find out more in Empire State Building, a title in the Structural Wonders of the World series. Structural Wonders of the World is a series of AV2 media enhanced books. Each title in the series features easy-to-read text, stunning visuals, and a challenging educational activity. A unique book code printed on page 2 unlocks multimedia content. These books come alive with video, audio, weblinks, slideshows, activities, hands-on experiments, and much more.

The Galapagos Islands are home to some of the world’s most interesting animals. The ecosystem of the Galapagos Islands is unique because of their distance from the South American mainland. Discover more in Galapagos Islands, one of the titles in the Natural Wonders of the World series.

The spectacular Great Barrier Reef is the largest coral reef in the world. There are more than 10,000 different species of animals living within it. Discover more in The Great Barrier Reef, one of the titles in the Natural Wonders of the World series.

Mount Aconcagua is nicknamed the “roof of the Americas.” It is the highest mountain in South America’s Andes Mountains. Learn more in Aconcagua, one of the titles in the Seven Summits series.