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'Cosmos' recap: From Alexandria to dark matter
'Cosmos' recap: From Alexandria to dark matter

"Cosmos" wrapped its 13-episode run this week by emphasizing the importance of knowledge and critical thinking by way of the scientific method in "Unafraid of the Dark." Despite a few missteps here and there, host Neil de Grasse has taken us on a memorable journey spanning the smallest scale (inside an atom) to the largest (the furthest reaches of the universe). This week's episode embodied the strengths and weaknesses of the series as a whole. We opened with the ancient library of Alexandria, once the greatest repository of human knowledge on the planet, with anywhere between 500,000 to 1 million scrolls -- until invading barbarian hordes ransacked the place, burning much of the...

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