BF, "conceptual" arguments are relevant ONLY in the absence of reliable data, which makes all of your "conceptual" arguments meaningless. There is TONS of reliable data. Actually, it's about 97% reliable. Why you refuse to acknowledge that is beyond me. And these "other factors" you keep talking about DO exist. That's exactl what explains the extra 3%. It Math 101 my man. We're not talking differential equations here.