Stuff You Should Know

The Silurian Hypothesis

<p>The idea that we aren’t the first advanced civilization to live on Earth sounds like a fringe theory, but it raises a good question: How can we be so sure that a civilization didn’t arise and die on Earth so long ago that any trace of it has been erased?</p><p>See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.</p>

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