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Battle for the Americas

Science  19 Jul 2013:
Vol. 341, Issue 6143, pp. 230-233
DOI: 10.1126/science.341.6143.230

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Summary

Scientists have long believed that the Isthmus of Panama formed 3 million to 4 million years ago, paving the way for a burst of migration between North and South America. A radical new hypothesis envisioning a much earlier land bridge could cast dozens of studies in a new light.