Today's lecture focuses on the impact of urban green spaces on mental health. Recent studies show that even small parks can reduce stress levels significantly. For example, a 2021 survey in London found that residents living within 500 meters of a park reported 20% lower anxiety scores. However, the quality of the space matters more than its size. Features like trees, water, and quiet paths are crucial. Interestingly, the benefits are stronger for older adults than for younger people, possibly due to more frequent use. So, when designing cities, planners should prioritize accessible, well-maintained green areas, not just large but empty lawns.