Like a fingerprint, the connections of the human brain render us distinct from one another. In a study just published in Nature Neuroscience, researchers from the University of Oslo revealed that such a unique, fingerprint-like pattern evolves during development and is sensitive to mental health. These findings suggest that such brain network maturation during the course of childhood and adolescence reflects an important aspect of healthy brain development, and may help develop better tools for finding the right diagnosis and treatments of mental illness.