We all intuitively know that being in nature helps us feel better.  Now, a study from the University of Leipzig has shown that living near trees in an urban environment is associated with fewer prescriptions for anti-depressant medications, which researchers take a sign of improved mental health.  They found that the uplifting effect of city trees was even more pronounced in lower socio-economic areas.  If you need a boost, a walk in a park or down a tree-lined street may be just what you need, they suggest.  You can read a summary of the research findings at Neuroscience News.