Scientists have mapped the entire brain of a fly, identifying all 130,000 cells and 50 million connections, marking the most detailed analysis of an adult animal brain. This breakthrough, described as a “huge leap” in understanding human brains, could illuminate the mechanisms of thought. Despite humans having a million times more neurons, the fly’s brain structure offers insights into complex computational tasks. The research, published in Nature, is expected to be transformative for neuroscience, aiding in understanding how brain cell networks enable interaction and information processing.