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Increasing ocean acidity poses threat to global reefs: study SYDNEY, Feb. 23 (Xinhua) -- A new study has revealed that many of the world's coral reefs are set to face the threat of erosion over the coming decades as ocean acidity levels continue to rise.
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Ancient cave paintings turn out to be by Neanderthals, not modern humans This curtain of stalactites in Ardales cave in Spain was painted with red pigment more than 65,000 years ago - then again 45,000 years ago.
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