Epidemiologists generally agree that smallpox is the cruelest disease ever to afflict the human race. In the century before it was eradicated in the 1970s, it killed more than half a billion people and left millions of others horribly scarred and blind. It inflicts unbearable suffering, both physical and psychological. It usually starts like the flu, with headache, fever, and body aches; and then it breaks out as a sore throat that soon spreads into a body rash. As the disease develops over the subsequent week, the victim often experiences frightful hallucinatory dreams and is racked by a
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