OTTAWAâ€”Scientists have made great progress in eradicating diseases that once maimed or killed millions of people. Think of smallpox. Or polio, which a few years ago was on the verge of disappearance though state instability and war allowed it to cling to life. The reason why these scourges were defeated (apparently there is a difference between eradication and elimination, but that distinction is beyond the scope of this column) is that efforts at developing vaccines or removing the
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