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Mysterious Life of Caves 1x57

Deep in the heart of the Guadeloupe Mountains in southern New Mexico, rock-eating microbes are at work. But their appetite is dainty compared with the voracious hunger their ancestors had millions of years ago when they carved some of the most impressive caves in the world. NOVA reports on a revolutionary theory of cave formation that has startling implications for the development of life on Earth and on other planets.

Sarah Holt