After camping in the outdoors it sometimes feels strange to return to living in a box with artificial light.  The Bible tells us people were meant to live outside, wearing only our skin.  Humans need a certain amount of sunlight because our skin makes vitamin D in response to sun exposure.  Because of the way we live now, most people are vitamin D and calcium deficient.  So likely the first two humans had plenty of vitamin D, but did they also have a lot of skin cancer?  Uplook Magazine July-August 2012, p.30.