NOVAفصل 19 افزودن تصویرشماره قسمت13Search for the First AmericansOverviewNOVA follows the trail of America's first inhabitants. Did they migrate across a Bering Sea land bridge at the end of the last Ice Age, as we all learned in school? Or did they arrive thousands of years earlier, possibly by some different route, as new archaeological evidence increasingly hints?Air dateOctober 20, 1992Runtime (min)60