Light-driven processes are important in a myriad of (bio)chemical processes. This seminar will focus on the way in which organic and biological molecules cope with near-UV light irradiation, and their intrinsic mechanisms that lead to their photostability and integrity. I will show how a deep understanding of the (photo)reaction mechanisms of these simple systems can be extrapolated for the development of more effective molecular systems in biomaterials, interfacial photocatalysts and in cancer therapy and prevention