I believe that the natural selection process and thus the gene pool is being altered dramatically because of our medical progress. People who not so long ago would have died before they could reproduce are being kept alive now and passing their inferior genes on to the next generation. I'm not saying this is a bad thing just pointing it out.
Like one of my high school friends used to say, "we have a natural selection process going on here, the football players and the cheerleaders always seem to wind up together".
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