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This short Why Files article describes how a newer technique, used with radiocarbon dating of sediments from the Bering Strait, allowed scientists to confirm that a land bridge between present-day Alaska and Northeast Asia (Russia) was a probable route taken by human settlers who reached the Americas 12,000 years ago. The previous date was too old by several thousand years, indicating the land bridge was not available when the crossing occurred. That date was based on larger contaminated samples of sediment. Scott Elias and colleagues from the Institute for Arctic and Alpine Research conducted the study.
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