Adding Schlieren textures and controlled roughness to the active medium in polariton lasers improves their performance to the point where lasing is achieved with simple metallic mirrors for the first time. Great work by Florian Le Roux, Andreas Mischok and Francisco Tenopala Carmona from my team. Check out our Nature Communications paper here: https://www.nature.com/articles/s41467-025-55875-1.