Is There Space for Other Sorts of Species to Comea?

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Science fiction is full of stories of intelligent aliens from other worlds. How would we know if a species like the silurians existed millions of years before humans? To find an answer, they imagined going into the far future and looking back on the remnants of our civilization.

Was there a technologically advanced species living on Earth long before humans? And if one had existed, how would we know?

This is the first episode of our new four-part series, Lost Worlds.

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