Explore the fascinating world of Brain-Computer Interfaces (BCIs) in this 45-minute EuroPython Conference talk. Delve into the basics of neurophysiology, learn how BCIs function, and discover the hardware needed to measure brain electrical activity. Gain insights into Timeflux, an open-source framework for biosignal acquisition and real-time processing, and understand its architecture for building processing pipelines and browser-based interfaces. Witness a demonstration of a mind-controlled virtual keyboard. Suitable for beginners, data scientists, machine learning enthusiasts, and web developers, this talk covers neural rehabilitation, neurofeedback, EEG systems, and the future of BCIs in Python. Learn about consumer and research-grade EEG devices, Timeflux's supported devices, and its easy-to-learn documentation. Explore applications, directed acyclic graphs, custom nodes, and interfaces while getting a glimpse of upcoming developments in the field.