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  1. Oceans

    Ancient tsunamis reshaped Mars’ landscape

    Ancient tsunamis generated by meteorite impacts may have reshaped ocean coastlines on Mars.

    By Thomas Sumner
  2. Life

    1.56-billion-year-old fossils add drama to Earth’s ‘boring billion’

    Ancient multicellular eukaryotes big enough to be seen by the naked eye discovered in 1.56-billion-year-old rock in China may be an ancestor of modern algae.

    By Meghan Rosen
  3. Oceans

    The Arctic Ocean is about to get spicier

    Variations in the saltiness and temperature of seawater of the same density, called spiciness, could increase as the Arctic Ocean warms.

    By Thomas Sumner
  4. Health & Medicine

    Math offers new view of brain and its disorders

    Editor in chief Eva Emerson discusses new insights into the brain's role in mental illness, sleep, and ancient rituals.