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Humans inhabited New World's doorstep for 20,000 years

The human journey from Asia to the New World was interrupted by a 20,000-year layover in Beringia. Furthermore, the New World was colonized by approximately 1,000 to 5,000 people -- a substantially higher number than the 100 individuals of previous estimates. The developments, published in Wednesday's PLoS ONE, help shape understanding of how the Americas came to be populated -- not through a single expansion event but in three distinct stages separated by thousands of generations.

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Keywords: humans, inhabited, world, doorstep, 000, human

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