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A recent study of animal bones found in a Mexican cave suggests the first humans in the Americas came by sea 20,000 years before the Bering Strait crossing.

United statesIowa state universityBering straitArctic oceanChristopher gannonRichards macneishAndrew somervilleChristopher gannon iowa state universityUniversity of texasAndrew somerville iowa state universityFirst american research mustBering land bridgeCave evidenceFirst humansNative americanAmerican research must continue