Atomic physics last week settled another anthropological argument: the age of Folsom Man. Ever since 1926, when a peculiar stone spear point was found at Folsom, N. Mex., U.S. archeologists have debated the antiquity of the culture that produced it. Some argued that the oddly grooved "Folsom points" were made by ancestors of modern Indians only some four or five thousand years ago. Others were sure that they were 10-20,000 years old and were made by nomadic hunters far more primitive than the Indians.
There was not much to judge by. The grooved points have showed up all over the southwest and...
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