Are There Lost Alien Civilizations in Our Past?
Kurzgesagt – In a Nutshell · 1 HN recommendations
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Kurzgesagt asks whether advanced civilizations could have existed on Earth in the deep past and left little evidence. It looks at time as a dimension for searching for alien civilizations and the limits of the geological record.
Why HN recommends it: HN brings it up in threads on ancient civilizations and detecting past technology in geology.
“I enjoyed Kurzgesagt's video [0] about our ability to sense ancient aliens.” Read on HN ↗