The eradication of smallpox was one of humanity's great success stories. After thousands of years of suffering at the hands of the virus, the human race gathered all its wit and cunning and conquered the scourge, eradicating it forever. Well, forever lasted less than 25 years. It does not bode well for the future of our species that it took but a blink of the eye for one of history's worst killers to make a comeback--not on its own, mind you, but brought back by humans to kill again.
During the age of innocence--the '90s, during which it seemed history had...
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