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

https://www.nasa.gov/news/releases/latest/index.html

Imagine if, many millions of years ago, dinosaurs drove cars through cities of mile-high buildings. A preposterous idea, right? Over the course of tens of millions of years, however, all of the direct evidence of a civilization—its artifacts and remains—gets ground to dust. How do we really know, then, that there weren’t previous industrial civilizations on Earth that rose and fell long before human beings appeared?
Source: Psys.org
We think we’re the first advanced earthlings—but how do we really know?
Psys.org

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