Explore the remarkable journey from Alan Turing's theoretical breakthroughs to the birth of practical computing. This episode examines how Turing's 1936 paper 'On Computable Numbers' and his concept of the Turing machine laid the mathematical foundation for all modern computers. We delve into the wartime developments at Bletchley Park, where Turing's work on the Bombe machine bridged theory and practice. The episode covers the parallel development of early computers like ENIAC in America and Turing's own ambitious ACE design at the National Physical Laboratory. Dr Sarah Quinn explains how these pioneering efforts transformed abstract mathematical concepts into room-sized electronic machines that could perform complex calculations. The discussion highlights the collaborative nature of early computing development and the engineering challenges faced by teams working to make Turing's theoretical visions reality. Perfect for listeners interested in computing history, the evolution of technology, and understanding how theoretical mathematics becomes practical innovation. The episode demonstrates how Turing's fundamental insights about computation continue to influence computer design today, from smartphones to supercomputers, establishing principles that remain central to modern computing architecture and artificial intelligence development.