At some undetermined point in the great immensity of its past—perhaps 45,000 years ago, perhaps 60,000, but certainly before there were modern humans in the Americas or Europe—it was quietly invaded by a deeply inscrutable people, the Aborigines, who have no clearly evident racial or linguistic kinship to their neighbors in the region, and whose presence in Australia can only be explained by positing that they invented and mastered oceangoing craft at least 30,000 years in advance of anyone else, in order to undertake an exodus, then forgot or abandoned nearly all that they had learned and
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