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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.

    By Sid Perkins
  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.

    By Ron Cowen
  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.

    By Nathan Seppa
  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.