News

  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. 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.

    By Sid Perkins
  4. Humans

    Calling all clues …

    Add flip-open cell phones to the list of crime-scene items that might harbor a suspect's DNA.