News

  1. Space

    First rock from the sun turns out to have ice

    Frozen material at the planet’s poles likely came from comet or asteroid impacts.

    By Tanya Lewis
  2. Health & Medicine

    Simulated brain mimics human quirks

    Model representing 2.5 million neurons performs calculations, issues instructions for a behavior, and then expands its decision into action.

    By Laura Sanders
  3. Earth

    Grand Canyon could be much older than thought

    Disputed dating of rock erosion pegs the ancient chasm as 70 million years old.

    By Alexandra Witze
  4. Earth

    Shrinking polar ice caused one-fifth of sea level rise

    Comprehensive analysis quantifies ice sheet loss in Greenland and Antarctica.