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-Today we take for granted that the world is round. In the fifteenth century, however, most people believed the world was flat. They thought that monsters or a trip over the edge of the earth waited for anybody who sailed outside the limits of known...
Bestselling Book Challenges Long-held Theories about Life in America before Columbus 畅销书展现哥伦布发现美洲之前美洲人的生活 Americans celebrate Columbus Day on October 10, commem...