Optical fiber networks, the inner workings of smartphones, light painting, and Laser Pink Floyd: there are myriad ways in which light impacts our lives, and on 16 May, UNESCO’s second International Day of Light (IDL) will celebrate them all. This year’s flagship event in Trieste will showcase just some of the areas – science, sustainable development, health, art, and communications – in which light creates and enables critical benefits. The overall program, Illuminating Education , will include a presentation by University of Auckland’s Cather Simpson (“Using Physics to Feed the Planet”); the National Optical Astronomy Observatory’s Stephen Pompea showcasing the fruits of public engagement within his field; and Imperial College London’s Jess Wade describing her next-generation, OLED research as well as her efforts to address gender imbalance in science. “The International Day of Light is an awesome opportunity to celebrate the science of light and scientists who work with opti...