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

	Riddles of the Sphinx A marvel of ancient engineering is vanishing. Can it be saved?

	Runaway Universe Astronomers grapple with some very big questions: what is the size and shape of the universe, and how will it end?

	Russia's Nuclear Warriors Go inside Russia's largest missile base, where soldiers still stand at the ready, awaiting orders to push the nuclear button.

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