I have been listening to an article by Florence Williams called the Three Day Effect. In it she suggests that three days outside enjoying nature can radically change your mindset and your brain. To study the idea, she joins an excursion to a riverside wilderness in Utah, Her guide is charismatic veteran who leads a group of other vets on these camping, hiking, canoeing adventures to help them with PTSD and other after effects of war. He believes strongly in the power of nature to soothe and heal, which sounds pretty good to Williams, as she herself is struggling with the