Beneath the surface of every human cell lies a story written in genetics — a story of how quickly it divides, how stubbornly it survives, and how vulnerable it is to the world's invisible harms. Researchers at UCLA have developed a method called 'cell village' that pools neural progenitor cells from dozens of genetically distinct donors into a single shared culture, stripping away the technical noise that once obscured genuine biological difference. By pairing this approach with a new statistical tool called Townlet, they have begun to map the genetic architecture of cell fitness — tracing why