Scientists have mapped every neuron in the brain of an adult female fruit fly, a significant achievement in neuroscience. The fruit fly’s brain, no larger than a poppy seed, contains 139,255 neurons and 50 million connections. This detailed connectome surpasses previous efforts, marking a major leap from initial studies on simpler organisms like the worm Caenorhabditis elegans. The research, potentially Nobel-worthy, is expected to transform Drosophila neuroscience, offering insights into more complex brains.