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Stress usually occurs when people operate at the edge of their abilities - when they push themselves or are forced by circumstances to stretch beyond their familiar zones.
A team from Cornell University in the US found that spending 10-50 minutes with nature was the most effective way to improve mood, blood pressure and heart rate.
Published in the Journal of Children and Media, the research showed that when adolescent girls spend too much time agonising over which photo of themselves.
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