And yet although the Mayas knew about the wheel，they never used it. Neither did they use metals other than copper. What is ever more surprising is that they suddenly abandoned(抛弃) many of the cities and built new ones in the jungle. Some time around AD900，Mayan civilization collapsed. By the year 1200，their last great capital，Chichen Itza，was deserted.One of the most surprising findings about Mayas was that ______.
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