Can Tree Rings Explain the Demise of a Lost Civilization?

Smithsonian Channel Pick of the Week

English - July 11, 2016 16:00 - 2 minutes - ★★★★ - 31 ratings
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Archaeologists believe the sudden destruction of a pre-Columbian civilization found in southern Illinois occurred around 1150 AD. But to find the cause of such upheaval, they look to the surrounding trees.