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Scientists propose a radical idea of what killed off mammoths and other Ice Age animals.
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An acclaimed photographer joins scientists to document the runaway melting of glaciers.

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Why do huge swarms of rats overrun a bamboo forest in India once every half-century?
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NOVA  ·  Episode 3605

Darwin's Darkest Hour

10/05/2009

NOVA and National Geographic Television present a two-hour drama on the crisis that compelled Darwin to publish his theory of evolution.

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