Manage episode 236428432 series 49427
Published on May 31, 2018.
Humans are believed to be the most technologically advanced civilization that’s ever set foot on Earth, or really anywhere in the Solar System. But are we the first? Could there have been an advanced civilization that walked the Earth millions or even billions of years ago, and then died out long ago, their technology and structures lost to the eons. And how could we know?
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1614 episodes available. A new episode about every 0 hours averaging 28 mins duration .