Researchers hailing from the Cavendish Laboratory at the University of Cambridge and the University of St Andrews in the UK have made a remarkable discovery: when luminescent molecules are situated within gaps measuring less than one nanometer in width between gold nanoparticles, they exhibit synchronous flashing, akin to the coordinated glow of fireflies. This finding defies long-held beliefs regarding the emergence of optical coherence and paves the way for innovative applications in highly sensitive room-temperature sensors, molecular photonics, and forthcoming quantum technologies. The pertinent research paper has been featured in the latest edition of Nature Nanotechnology.