Barriers to Becoming a Kardashev Civilization
36:05
Post-Science Civilizations
31:11
The Fermi Paradox: Technological Timebombs
20:14
What if Humans Are NOT Earth's First Civilization? | Silurian Hypothesis
8:54
Germany’s Far-Right Comeback | NYT Opinion
24:20
Becoming a Kardashev-1 Post-Scarcity Civilization
37:43
Alien Embassies
31:31
Exo-Stellar Civilizations
32:31