The Kardashev Scale & Population
1:31:48
Impossible Technologies: The Clarketech Compendium
32:23
The Fermi Paradox: Galactic Great Filters
57:30
What Is The Universe Expanding Into?
26:28
The Bernal Sphere Space Habitat
43:50
Civilizations At The End Of Time: Eternal Intelligence
33:02
The Fermi Paradox: Rare Complexity
25:24
The Fermi Paradox: Hermit Hypothesis
21:34