Video: Carl Sagan Speaks part of Carl Sagan

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Last mentioned in San Francisco : CA : USA

Carl Edward Sagan ( /ˈseɪɡɪn/; November 9, 1934 – December 20, 1996) was an American astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator...

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Carl Sagan Speaks

Sagan kicks humanity down some important knowledge.
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