From TIME: In 1972, 51 of the most troubled mental health patients at Oregon State Hospital were sent into the woods for a camping trip. The trip was greatly helpful to the patients; 14 of the patients who participated in the trip were eventually released from the hospital.
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I always thought this would be a good idea, this one I never looked for but ever since the internet and the ability to do searches it seems I can almost never think of anything first.