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Science is secretly at work behind the scenes of major cities of the world and will continue to be so. Technological advances in fields as diverse as quantum mechanics, electronics, and nanotechnology are proving increasingly important to city life, and the urban world will turn to science to deliver solutions to the problems of the future; more than 50 percent of the world's population now lives in cities, and that proportion is growing fast. Can engineering provide the answer to a viable megacity future?Science and the City starts at your front door and guides you through the technology of everyday city life: how new approaches to building materials help to construct the tallest skyscrapers in Dubai, how New Yorkers use light to treat their drinking water, how Tokyo commuters' footsteps power gates in train stations.