What If Intelligence Re-Emerges?
23:16
The Problem With "The Rare Earth Hypothesis"
28:13
The Odds of Life and Intelligence
25:03
The First Civilization to Emerge in the Galaxy
21:34
The Final Barrier to (Nearly) Infinite Energy
23:35
Galactic Colonization
33:12
Why We May Be Surrounded by Older Alien Civilizations
52:39
What Is Hidden In The Darkness At The Beginning Of Time?
18:35