Science: Horatius at the Bridge

In Europe, Asia and Africa have been found fossil men hundreds of thousands of years old-perhaps even a million years old. But not in North America. It seems likely that the first North Americans were Asiatics who crossed a land bridge which once existed between Siberia and Alaska. Fifteen years ago it was generally believed that this migration occurred very late in the Stone Age, only 4,000 or 5,000 years ago, perhaps even later. Claims of greater antiquity were inexorably demolished, and largely through the efforts of one man—famed, Bohemian-born Ales Hrdlicka of...

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