The Silurian hypothesis: Was there a civilization on Earth before humans?
Alien hunters tend to look at other faraway worlds and galaxies in the search for extraterrestrial life. However, have you ever considered the possibility that a civilization existed at some point before humanity evolved on Earth?
After all, the Earth is around 4.5 billion years old. That's a lot of time for the right conditions to arise. Thus, we could speculate that it's possible for civilizations to have gone completely extinct and that their relics have been buried beneath our feet for hundreds of years.
This video by the YouTube channel Kurzgesagt delves into this idea, the Silurian hypothesis, and what science has to say about it, as well as what the implications are for us. Could we find evidence that ancient aliens built a relatively short-lived industrial civilization long before our own? If you want to learn, make sure you watch the video embedded above, and as always, enjoy.