Glow-in-the-dark materials are already used in some bike lanes, and in the future could be applied to sidewalks, streets and buildings — saving energy and reducing urban heat. ✍️ Kurt Kleiner: https://knowablemagazine.org/content/article/technology/2021/will-glow-in-the-dark-materials-someday-light-our-cities #InternationalDayOfLight #ScienceMastodon #KnowableMagazine