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Carl Sagan - A Thousand Years of Darkness

In this excerpt from the final episode of Sagan's 'Cosmos,' he discusses why the momentous discoveries of the ancient world were unable to prevent the dark ages from virtually banishing scientific thought for a millennium, and how the ancient world's greatest repository of knowledge, the great library of Alexandria, met its regrettable end. A sobering statement on what ignorance, apathy and fanaticism can do if left unchallenged.

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