Frans de Waal, who explored empathy among apes, dies at 75 :

Frans de Waal was just starting his career in primate research in the mid-1970s when he watched a male chimpanzee aggressively confront another at a zoo enclosure in the Netherlands. Awhile later, the chimp calmed down and held his palm up, a gesture of reconciliation. The two chimps hugged. The moment sparked a lifetime exploration, […]

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