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  1. Ecosystems

    Where Tuna Go: Atlantic fish mix for feeding, not spawning

    The largest high-tech tag study yet of Atlantic bluefin tuna suggests that two groups mix on feeding grounds but spawn on opposite sides of the ocean.

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  2. Astronomy

    Shell of a finding

    A new X-ray portrait of a supernova remnant suggests that this shell of hot gas may be hard to discern if the interstellar medium around the exploded star has extremely low density.

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  3. Earth

    Bed of Armor: Large rocks hold fast in flooding streams

    The relative proportions of rocks of various sizes in gravel-lined streams remain constant, even during substantial floods.