An international team of researchers has reconstructed the brain structure of a fruit fly (Drosophila melanogaster) for the first time. Scientists from the FlyWire consortium – including biologist Dr Katharina Eichler from Leipzig University – created a connectome, or a circuit diagram, of the insect’s brain. This is considered a milestone by the scientific community as it is the largest brain circuit diagram ever created. Accompanying studies demonstrate the usefulness of the connectome for the study of neuronal processes and give an insight into how this resource will revolutionise this field of research.