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Supertopics:
Famous Atheists
Physicists

Sagan, Carl

Subtopics and Documents:
how the ancient Greeks knew that the Earth is not flat
webCarl SaganYouTube
Carl Sagan warned of global warming in 1990
webShannon CooperThe Manual2022-11-20
Carl Sagain tells Congress of greenhouse effect in 1985
webYouTube1985-08-19
Sagan and Druyan say other species are like us