How many alien civilizations are out there?

Some thoughts based on the Drake equation. Please check out our sponsors:
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OUTLINE:
0:00 - Introduction
2:22 - New stars
2:45 - Planets
3:23 - Habitable planets
4:52 - Life
6:54 - Intelligence
8:20 - Communication
9:47 - Civilization lifetime
12:35 - Civilization rebirth
13:02 - Estimated number of intelligent alien civilizations
14:44 - My view and takeaway

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Видео How many alien civilizations are out there? канала Lex Fridman