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We take so many things for granted today. We have clocks that show the time, electric lights, music on the radio, telephone conversations with friends, computers, antibiotics that cure us when we are ill, But ever as recently as 150 years ago, many of these things were not available or possible. This fascinating book examines twenty concepts and things that have transformed our lives and the way we live. It looks at the thought behind these ideas and inventions and the amazing lives of the people who finally pulled it all together.