John Franklin Enders, 63, was on his way to earning a Harvard Ph.D. in English when he met the late great Microbiologist Hans Zinsser. Inspired by Zinsser, Enders switched to bacteriology. But inspiration, he insists, has little place in the practical results of research. "As a rule, the scientist takes off from the manifold observations of his predecessors . . . The one who places the last stone and steps across to the terra firma of accomplished discovery gets all the credit." Thus Dr. Jonas Salk...
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