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  1. Earth

    New mantle model gets the water out

    A novel notion of geophysical processes taking place deep within our planet may explain why the upper layer of Earth's mantle is relatively depleted of many trace elements.

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  2. Astronomy

    Solar system replica?

    Carefully monitoring the motion of a star 90 light-years from Earth, astronomers have found what may be the closest analog known to our solar system.

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  3. Health & Medicine

    Grades slipping? Check for snoring

    Children who snore frequently are more likely to struggle with their schoolwork than are children who rarely snore.

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  4. Paleontology

    Fossils’ ear design hints at aquatic lifestyle

    New studies of distinctive skull structures in fossils of one of Earth's earliest-known four-limbed creatures suggest the animal could hear best when it was underwater.