By chance, a small hospital in Pennsylvania became the setting of a remarkable experiment. Scientist Roger Ulrich noticed some surgery patients recovered in a room with a view of leafy trees, while others recovered in an identical room, except its windows faced a brick wall.
Ulrich decided to test whether the view made any difference in the outcome for patients. He looked back at records on gall bladder surgery over a period of 10 years. The results proved enlightening…
http://www.oregonlive.com/health/index.ssf/2009/05/the_best_natural_healer_turns.html