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So what makes the bacteria in these caves so rich in antibiotic potential?
BBC: Cave bacteria could help develop future antibiotics
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But if it was meant as a simile, it could also be taken literally -- because in a number of these caves, the local speciality, Cabrales cheese (a blue cheese similar to Roquefort) is quietly ageing in the gloom.
BBC: Spain��s mountains made of cheese
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Colonel STEVE WILLIAMS (Deputy Commander, NATO): You've got these caves and these systems that these guys can in and cache weapons systems and then find other ways to come across the border, go to these cache sites and arm up.
NPR: NATO Beats Taliban in Battle, Works to Win War
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"The stalactites and stalagmites from these caves are a way of looking back in time to see how warm periods similar to our modern climate affect how far permafrost extends across Siberia, " said Dr Anton Vaks from the University of Oxford.
BBC: Siberian cave
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Many of these underground water caves are considered sacred to the Mayan people.
FORBES: The Brooklyn-Grown Archeological Shop Inspired by Sacred Mayan Sinkholes
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The most important items in each of these boy-caves were the ever-present turntable and stacks of rock and roll records.
FORBES: Celebration Day: Invoking The Legacy Of Led Zeppelin
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Venture to the bowels of the Earth at these eerie 938-metredeep caves in the Muotatal district.
BBC: Mini guide to activities in Switzerland
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Caves were essential for these Ice Age bears to hibernate during the winter months.
BBC: Early human 'squatters' drove cave bears to extinction
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These coprolites came from a complex of caves in Oregon.
ECONOMIST: The first Americans
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During these lean months, they don't go into caves but rather experience a "walking hibernation, " eating very little and conserving their energy.
WSJ: Are Polar Bears Really Disappearing?
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These proxies include coral, ice cores, mineral deposits in caves, lake and ocean sediments, as well as a few historical records like grape harvest dates.
FORBES: New Study Shows Independent Evidence Of Global Warming
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She then correlated the data from these visits with estimates of local rainfall made by examining the composition of rocks from nearby caves.
ECONOMIST: Climate change and civilisation