While we are biologically similar to our Stone Age ancestors, most of us spend nearly all of our time indoors, removed from the natural world. Studies have shown that time outdoors in or near nature delivers emotional, psychological, and physical benefits. The founder of Greentime AS, a company dedicated to designing nature-enhanced workspaces, Jørn Viumdal explains the principles of Skogluft (Norwegian for "forest air") and the surprising advantages of maintaining a particular selection of plants in your home or office that can reduce fatigue, strengthen the immune system, and enhance concentration, while removing toxins from the air.