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People gather to demonstrate against Iceland's prime minister in Reykjavik on Monday. The prime minister insisted he would not resign after documents leaked allegedly linked him to an offshore company that could represent a serious conflict of interest. Brynjar Gunnasrson/AP hide caption
Human sacrifice helped solidify systems of social hierarchy, according to a new study of traditional cultures in the Pacific Ocean. Here, an engraving shows English explorer James Cook witnessing a human sacrifice ritual in Taihiti in the 1770s. The image comes from the 1815 edition of Cook's Voyages. Universal Images Group/Getty Images hide caption