Just for kicks, I googled fear of outside this morning. My search turned up 187 million results. For comparison's sake, I then googled fear of death and fear of the unknown, fears I thought were fairly common. To my surprise, there were only 84.7 and 73.5 million hits, respectively, and when combined, still fewer results than my first search. While the findings of my quick internet inquiry will probably never hit the annals of any reputable science journal, there is a growing body of evidence that America is becoming increasingly sedentary and spending a lot of time indoors (you can find the facts on the Children & Nature Network's site).
Thanks for reminding us how awesome Great Outdoors Month is Jackie!