This book is extensively dealing with Technology and Applied Sciences. It covers the first technologies; irrigation systems, road networks and wheeled vehicles, a pictographic form of writing and building techniques. It carries on with the 19th century sciences and new technologies, such as the telegraph, the telephone, electricity generation and photography. It continues into the 20th century with advances in the natural sciences, including radio and television, sound recording and reproduction, synthetic fibres, pharmaceutical products, nuclear power, and the development of the computer and information technology, as a new technological revolution. It also covers; pollution, depletion of energy resources, renewable energy sources such as solar and wind power, the recycling of raw materials, conservation of energy, and about people who in recent years sought to develop appropriate technologies, using local materials and techniques, in partnership with the indigenous peoples.