The Greatest Carl Sagan Videos

Anasazi People's Calendars
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Best Scenes from Cosmos
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Pale Blue Dot
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Title: Anasazi People's Calendars

Category: History

Views: 2436

Title: Library of Alexandria

Category: History

Views: 2697

Title: Pre Socrates Philosophers (Part 1)

Category: History

Views: 2420

Title: Pre Socratic Philosophers (Part 2)

Category: History

Views: 1887

Title: Googol and Googolplex

Category: History

Views: 2046