The Kardashev Scale & Population
57:30
What Is The Universe Expanding Into?
32:23
The Fermi Paradox: Galactic Great Filters
42:40
LIFE BEYOND 3: In Search of Giants. The Hunt for Intelligent Alien Life (4K)
43:22
Defending Earth
24:52
The Most Useful Thing AI Has Done
29:23
Exploring the Secret US Government Town with No Internet & Phone Service (100% Disconnected?)
55:52
Transcendence: The Fermi Paradox, Enlightenment & Singularity
46:09