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The increase in allergies is probably the part inflamed by better diagnostics, the proper concept of an allergy and doctors with the skill to correctly diagnose it as such is a recent phenominon. ADHD, ADD and other hyperactive disorders might stem from the rapid change in youth lifestyle from very active (farm life) to very sedative (school and TV). Retardation? Well now they live long enough to be diagnosed, you don't want to hear my other theory. The most convincing theory about why the incidences of genetic disorders (far more things have genetic roots than most people think) is that the people carrying these genes are now reproducing with help from the rest of us. Deal with the politial incorrectness when I say we are weakening our gene pool (no Nazi references, just take it at face value). Our immune systems are advancing at nearly the same rate as bacteria and viruses so I don't think it's a big factor in all but a few cases.
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The most valuable renewable resource is stupidity.
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