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Monday, April 16, 2018

We think we're the first advanced earthlings -- but how do we really know?

https://ift.tt/eA8V8J 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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