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Mental health is a 
 problem around the world. More people are suffering from 
, depression, and other disorders. In the USA, 
 in five Americans has mental 
 problems. The research has good 
 on how nature can help us. It says time spent among trees or in 
 helps us sleep better and improves our concentration. Moreover, a study from Japan found that 
 have positive effects on mental health. Researchers found that 
 who had a 
 of roses on their desk became 
 after just four minutes.