Stanford University Apr 13 2026 Light has an increasing number of applications in biology and medicine – it can be used to stimulate cell growth, manipulate neural signals, and treat some cancers – but it doesn't easily pass through tissue. Most methods to bring light deep within the body are invasive, requiring either tissue to be removed or an optical fiber to be inserted. Researchers at Stanford have created a noninvasive way to deliver light to specific locations anywhere in the body. Their