and create a "comfortable" area as opposed to living outdoors and adapting to climatic conditions. This makes us both weaker, physically and stronger evolutionally because we insist that the environment conform to us rather than the other way around. Many years of living outdoors has convinced me that many ailments we suffer is due to inhibited immune systems created by airfilters etc.
As to AIDS that little feller grabs our immune system and says dont fight any more by turning receptors deaf. Diseases such as Lupus and Rheumatoid arthritus are diseases that covert the immune system to attack healthy tissue. Some thinking is that these are related as a slow virus. The whole concept of the human immune system needs a boatloads more study.
thanx,
bill