We think we're the first advanced earthlings -- but how do we really know?
Date:
April 16, 2018
Source:
University of Rochester
Summary:
Imagine if, many millions of years ago, dinosaurs drove cars through cities of mile-high buildings. A preposterous idea, right? In a compelling thought experiment, scientists wonder how we would truly know if there were a past civilization so advanced that it left little or no trace of its impact on the planet.
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FULL STORY
https://www.sciencedaily.com/releases/2018/04/180416124327.htm
