Every decade has a unique hematological riddle, and for Minot’s era, that riddle was pernicious anemia. Anemia is the deficiency of red blood cells—and its most common form arises from a lack of iron, a crucial nutrient used to build red blood cells. But pernicious anemia, the rare variant that Minot studied, was not caused by iron deficiency (indeed, its name derives from its intransigence to the standard treatment of anemia with iron). By feeding patients increasingly macabre concoctions—half a pound of chicken liver, half-cooked hamburgers, raw hog stomach, and even once the regurgitated
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