Explore groundbreaking optical technologies in this 17-minute TED Talk by inventor Mary Lou Jepsen. Witness mind-bending demonstrations showcasing how red light can be utilized to visualize and stimulate internal bodily and brain functions. Delve into cutting-edge advancements at the frontier of optical physics, as Jepsen unveils innovative techniques for tumor tracking and neural activity measurement. Learn about the potential for these technologies to revolutionize medical imaging by potentially replacing traditional MRI machines with more cost-effective, efficient, and wearable alternatives.