• 

  carlsagandotcom - YouTube

  https://www.youtube.com/user/CarlSaganPortal

  Official YouTube Channel for the works of celebrated scientist and astronomer Carl Sagan.

• 

  Carl Sagan - Cosmos - Drake Equation - YouTube

  https://www.youtube.com/watch?v=MlikCebQSlY

  Carl Sagan - Cosmos - Drake Equation

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