This course is for anyone wondering how computers work, why they suddenly seem so smart, and how they compare to the human brain. Computers, at their core, are simple beasts, and yet they confound us with their brilliance and their stupidity, especially with the advent of deep learning. After looking at how computers work, we introduce neural networks, using the classic example of image recognition, where we see parallels with the human brain and where we set the scene for a long section on ChatGPT and its cousins. The course leans more towards theoretical concepts like how computers learn, rather than practical skills such as using a computer or getting some sense out of a chatbot. Discussion will be welcome. No previous knowledge is required.