An established theory says the first Americans walked across the Bering Sea about 13,000-15,000 years ago. But stone tools found in the mid-Atlantic suggest an arrival from Europe about 20,000-22,000 years ago. The tools match those made by the mysterious Solutrean people of ice-age Iberia. Read related article.

Source: Dennis Stanford and Bruce Bradley | The Washington Post February 29, 2012
Show Comments