subject: Healthy Inside And Out [print this page] We need a defense that will workWe need a defense that will work. Since we are under attack, it's reassuring to learn that mother nature has furnished us with basic methods to maximize our defense. If you must put in a considerable amount of time indoors, a basic nature simulating unit can change your sick air into living air, provide you many happy lungs full of fresh air, and make a big difference in your overall health.