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An acclaimed photographer joins scientists to document the runaway melting of glaciers.
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Examine the high-tech eavesdropping carried out by the National Security Agency and the...

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Follow the 2,000-mile migration of monarchs to a sanctuary in the highlands of Mexico.
NOVA  ·  Episode 3603

Rat Attack


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

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