Science: First Americans

Anthropologists tell time in large, round numbers. When their clocks and calendars go wrong, their calculations go wrong in a big way. Man's arrival in North America, for example, says Johns Hopkins Professor George F. Carter, has been misdated by an interglacial age or two—a mistake of perhaps 300,000 years.

Until Dr. Carter corrected the anthropological calendars in the winter issue of the Southwestern Journal of Anthropology, most of his colleagues thought man discovered the North American continent late in the last ice age, 10-20,000 years ago. Arctic hunters, so the theory ran,...

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