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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