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Brillouin microscopy is opening a new window onto biological mechanics—but the next frontier is not simply measuring faster; it is understanding what the measurements mean. A new review in PhotoniX Life, “Brillouin Microscopy: Bridging Photonics and Mechanobiology,” traces rapid advances in Brillouin imaging and critically examines how optical signals can—and cannot—be translated into biomechanical properties. By connecting photonics, material physics, and biological function, the review highlights key confounding factors, emerging multimodal strategies, and the path toward more rigorous mechanobiological insight.