News

  1. Space

    Galactic smashup leaves dark matter debris

    Find in ‘train wreck’ cluster forces astronomers to re-think theories about relationship between mysterious dark matter and galaxies.

    By Nadia Drake
  2. Health & Medicine

    Excess salt may stiffen heart vessels

    As sodium in diet increases, a coronary risk factor independent of blood pressure escalates, according to a study in middle-aged U.S. men.

    By Janet Raloff
  3. Life

    Sawfish don’t saw

    Spiked snouts whack prey to the bottom, helping the predator better get its mouth around dinner.

    By Susan Milius
  4. Life

    Fossil pushes back land-animal debut

    Creatures first squished mud through their five toes millions of years earlier than previously believed.