Scientists often study the past as obsessively as historians because few other professions depend so acutely on it. Every experiment is a conversation with a prior experiment, every new theory a refutation of the old. Farber, too, studied the past compulsively—and the episode that pivotally fascinated him was the story of the national polio campaign. As a student at Harvard in the 1920s, Farber had witnessed polio epidemics sweeping through the city, leaving waves of paralyzed children in their wake. In the acute phase of polio, the virus can paralyze the diaphragm, making it nearly impossible
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