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A pandemic would change that, maybe some form of avian flu, just to throw something out there.
Also, i have one flaw i just thought of...height. We have continually been getting taller. Think about the 1500's for example, people were short. I have no graph to present, but im sure it would show a constant increase. I'm 6'0'' which i guess some would consider tall but im sure that would have been more extreme say, around, the turn of the 20th century.
But, I still see the point your making.
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