When John von Neumann runs into fellow mathematician Herman Goldstine at a train station, Goldstine clues him into a new powerful computer called the ENIAC that is being constructed to help with the war effort, and Johnny immediately grasps the machine’s enormous potential. Though the computer is not completed in time to be useful in the second world war, it finds new purpose in the war’s aftermath. Soon, Klári von Neumann is enlisted to instruct the machine what to do, and in doing so, becomes one of the first coders. This episode takes a deep dive into the workings of the ENIAC and the origins of computing in the 1940s.