The document discusses how social experiences shape the human brain and the importance of considering the social environment of schools. It covers three main themes: how social experiences affect the brain by changing its structure and function; the complex nature of the "social brain"; and how to enhance the social experience of schools. The social brain is regulated by different areas that respond to social cues, stress, bonding and more. Schools must provide opportunities for social cognition, grouping, play and skills development to support students' social brain development.