In today's lecture, we'll discuss the impact of urban green spaces on mental health. A recent study followed 1,000 adults over five years. Participants who visited parks or gardens at least once a week reported 20% lower stress levels compared to those who rarely went outside. Interestingly, the type of activity mattered less than the frequency. Even passive activities like sitting on a bench had benefits, as long as they were done regularly. However, the study noted that the effect diminished when green spaces were crowded or poorly maintained. So, for city planners, ensuring accessible and well-kept parks is crucial, not just their existence.