In 1955, Harlow conceived the bold idea of starting his own breeding colony of rhesus monkeys. Nobody had ever created a self-sustaining breeding colony of monkeys in the United States, let alone in the cold climate of Wisconsin, but Harlow was undeterred. He allowed his rhesus monkeys to mate, and then he took away the children within hours of their birth—to save them from infections in the crowded lab. After much experimentation, he and his students created an artificial baby formula full of nutrients and antibiotics. They found the optimum pattern of feeding, light and dark cycles, and
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