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Why do huge swarms of rats overrun a bamboo forest in India once every half-century?
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Follow the 2,000-mile migration of monarchs to a sanctuary in the highlands of Mexico.

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Can California's ambitious plan to cut greenhouse gases actually succeed?
NOVA  ·  Episode 3602

The Spy Factory


Examine the high-tech eavesdropping carried out by the National Security Agency and the pitfalls of surveillance in an age of terrorism.

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