Dr. Catherine Zeman's presentation delves into the intricate relationship between environmental factors and health outcomes, particularly focusing on disparities across human communities. By analyzing trends in U.S. lifespan and healthcare expenditures, Dr. Zeman highlights the divergent pathways experienced by different racial/ethnic groups. She underscores the impact of neighborhood characteristics, such as income levels and educational attainment, on health outcomes, emphasizing the increased risk of chronic diseases and limited access to healthcare services in disadvantaged areas.