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  1. Readers ask about bird droppings, Ice Age cave art and more

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  2. Paleontology

    310-million-year-old fossil blobs might not be jellyfish after all

    An ancient animal called Essexella may have been a type of burrowing sea anemone, a new study proposes.

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  3. Where does plastic go when we’re done with it?

    Editor in chief Nancy Shute discusses the ubiquity of microplastics in food, water, air and the body.

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  4. Climate

    By flying over atmospheric rivers, scientists aim to improve forecasts

    Drenching atmospheric rivers are slamming the U.S. West Coast, bringing needed water but dangerous flooding. Here’s how scientists study these storms.