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  1. Life

    Rock-hard evidence

    Newly discovered dinosaur tracks, the first ever reported from the Arabia Peninsula, indicate that a part of the now-arid region was teeming with dinosaurs about 150 million years ago.

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  2. Climate

    Ocean reflux

    Upwelling off Californian coast offers taste of predicted ocean acidification.

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  3. Letters

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  4. Science Future

    Through June 15 “Darwin’s Garden: An Evolutionary Adventure,” at the New York Botanical Garden. Visit the New York Botanical Garden online. September 27 Scheduled opening of Ocean Hall at the Smithsonian National Museum of Natural History in Washington, D.C. Visit The Smithsonian National Museum of Natural History online.