Mayans left their homes, approximately in A.D. 610, perhaps within a single week, even within one day. Some appear to have fled northward, to establish new cities, but there is evidence that countless thousands just disappeared. All within a shockingly brief span of time. They didn’t bother to take many of their pots, tools, cooking utensils . . . My learned colleagues say the land around those Mayan cities became infertile, thus making it essential that the people move north, where the land would be more productive. But if this great exodus was planned,
