https://www.youtube.com/watch?v=_DQYiyQ7Tkk
"Jan 25, 2021 by Sean Carroll
The possible existence of technologically advanced extraterrestrial civilizations — not just alien microbes, but cultures...
Type: Posts; User: Kathy; Keyword(s):
https://www.youtube.com/watch?v=_DQYiyQ7Tkk
"Jan 25, 2021 by Sean Carroll
The possible existence of technologically advanced extraterrestrial civilizations — not just alien microbes, but cultures...