NATIONAL New theories on the Anasazi By LEE BOWMANScripps Howard News ServiceFebruary 18, 2003DENVER - The well-preserved villages of the Anasazi and other native peoples who lived in what is now the high desert of the U.S. Southwest more than a thousand years ago suggest that the canyon cities were suddenly abandoned. But new evidence presented by researchers at the annual meeting of the American Association for the Advancement of Science on Monday indicates that occupation of many of the ancient pueblos was an on-again, off-again thing over the centuries. "There's been an erroneous impression that all or most of...