How many alien civilizations are out there? | Yuval Noah Harari and Lex Fridman

Lex Fridman Podcast full episode:    • Yuval Noah Harari: Human Nature, Inte...  
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GUEST BIO:
Yuval Noah Harari is a historian, philosopher, and author of Sapiens, Homo Deus, 21 Lessons for the 21st Century, and Unstoppable Us.

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