Archaeologist Natalie Mueller at WashU explains how ancient agricultural systems could become a source of alternative crops and methods in an era of rapid climate change.

Researchers from Tulane University and the Proyecto Templo Mayor analyzed 788 obsidian artifacts from Tenochtitlan, revealing that the Mexica (Aztec) Empire sourced this important material from at least eight different locations, including regions outside their political control. While 90% of artifacts were made from green obsidian from Sierra de Pachuca (especially for ceremonial purposes), the diversity of obsidian sources suggests sophisticated trade networks rather than just conquest-based acquisition. The study tracked changes in obsidian use from 1375-1520 CE, showing how the Mexica standardized ritual obsidian sources after consolidating power around 1430 CE, providing insights into the empire's economic networks and political influence.