A group of researchers in Mexico have designed a cement that is phosphorescent, meaning light is emitted without the use or need of electricity. On top of looking really cool, this technology would allow for sidewalks and structures to glow at night which would remove the need for lights to illuminate paths and buildings at night. The result of this reduced need for lighting would save energy as well as immensely cut down on light pollution. The cement can stay illuminated for up to 12 hours and the Mexican team is looking into how they can extend the duration of the glow even more. Further research is also being put in place to find out how to repair the cement without hindering the phosphorescence.