For the second time, scientists have charted every neural connection in the fruit fly brain — roughly 100,000 neurons rendered into a complete wiring diagram. This milestone in connectomics, achieved through a convergence of electron microscopy and artificial intelligence, offers humanity something rare: a fully legible nervous system. The fruit fly, small enough to map yet complex enough to learn and remember, serves as a mirror in which the deeper logic of all brains — including our own — begins to come into focus.