Today's lecture focuses on the impact of urban green spaces on mental health. Recent studies have shown that even small parks in city centers can reduce stress levels significantly. However, the key factor is not the size of the space, but its accessibility. For example, a study in Melbourne found that residents living within 300 meters of a park reported lower anxiety levels compared to those living further away. Interestingly, the quality of the green space, such as the presence of trees and water features, also mattered, but only when the park was easily reachable on foot. So, planners should prioritize creating small, well-distributed green areas rather than one large central park.