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  1. Earth

    Ancient Chasm: Parts of Grand Canyon may be 17 million years old

    The chemical composition of mineral formations in caves along the Grand Canyon may provide fresh insight into the chasm's history, including its age and the rate at which it was carved.

    By Sid Perkins
  2. Health & Medicine

    Cancer Risk: Colon growths might not be so obvious

    Some colorectal growths that are precancerous aren't polyps.

    By Nathan Seppa
  3. Math

    The Geometry of Music

    Music is an audible exploration of hyperdimensional geometries, according to new research.

    By Julie Rehmeyer
  4. Tech

    Finding mass graves from on high

    Aerial surveys that scan the ground at many wavelengths, some visible and some not, may offer a way to quickly and easily detect mass grave sites.