John McKinney reports on the restorative benefits of nature. In one study:

Students were given long tests of sequences of numbers to repeat in reverse then sent on walks half the study participants on a nature walk and half on a city walk. Upon re-testing, the nature walkers’ scores improved significantly while the city walkers’ did not. The experiment was repeated so that each student walked in nature and in the city, and everyone’s score was better after the nature walk.

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