“I see her,” he told the passenger in the car with him. “I don’t give a shit.” Except, actually, he did, or rather his physiology did. Modern medicine has long sought to attribute the higher rates of disease in African-Americans relative to white Americans to genetics. But it turns out that sub-Saharan Africans do not have high rates of high blood pressure, diabetes, and heart disease, while African-Americans have the highest rates of those conditions of all ethnic groups in the United States.