What if Humans Are Not Earth's First Civilization? (Silurian Hypothesis)
By PBS Space TimeFrom boclips.com
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We’re almost certainly the first technological civilization on Earth. But what if we’re not? We are. Although how sure are we, really? The Silurian hypothesis, which asks whether pre-human industrial civilizations might have existed.
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Physical Sciences
Astronomy
Geography and Earth Science
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Advanced Secondary
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