Cities are a big deal. More people now live in them than don't, and with a growing world population, the urban jungle is only going to get busier in the coming decades. But how often do we stop to think about what makes our cities work? Cities are built using some of the most creative and revolutionary science and engineering ideas - from steel structures that scrape the sky to glass cables that help us communicate at the speed of light - but most of us are too busy to notice. 'Science and the City' is your guidebook to that hidden world, helping you to uncover some of the remarkable technologies that keep the world's great metropolises moving.