This document discusses recent advances in brain-machine interface technology that allow people to control devices with their thoughts. It describes non-invasive interfaces that use infrared light and optical topography to map blood flow changes in the brain and translate thoughts into actions. Invasive interfaces with implanted electrodes can directly detect neural signals and enable tasks like moving a computer cursor. Challenges remain in improving accuracy and miniaturizing the technology for wider applications in communication, prosthetics, and medicine.