The global population will exceed 9 billion by 2050, with 7 billion of these people inhabiting urban areas. This prospect raises some fundamental questions for us all. Is it a good idea for us to allow cities grow indefinitely? What happens when the global population puts our cities at breaking point? Perhaps most importantly, how can we be ready for an explosion in demand for every resource in our urban areas? Dr Matthew Leeke from the University of Warwick will explore how computer scientists are leveraging state-of-the-art machine learning algorithms and data from the smart devices we used every day to solve some of the biggest problems facing our cities. Demonstrating applications ranging from policing and government intelligence to social networking and marketing, we will see how the analysis of data at an unprecedented scale is fundamentally changing the way our world works at Computer Science in Action enrichment days this autumn.