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Why is is that the Mayans had advanced astronomy, mathematics, and even aerospace engineering, and yet they were defenseless against germs?


I have been to Chichen Itza (even to the top of the Launchpad wink ) , Uxmal etc, the Mayans had not even mastered the architectural arch unlike somewhere like Durham Cathedral. (much much more impressive)

The Mayans just couldn't get enough headless corpses then playing basketball with the folks heads.

Imagining that the Mayans had aerospace and space flight capability probably says more about our own civilization than the Mayan one.