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  1. Tech

    Humane bloodletting

    Medical researchers have designed a new lancet that dramatically reduces the pain experienced by lab mice during blood-sampling procedures.

    By Janet Raloff

  2. Flu from horses is racing among dogs

    A highly contagious influenza virus that has killed greyhounds and sickened other dogs may have first jumped to canines from a single infected horse.

    By Ben Harder
  3. Planetary Science

    What whacked the inner solar system?

    Planetary scientists have determined that the cavalcade of space debris that hammered the inner solar system for the first 700 million years of its existence were main-belt asteroids, not comets.

    By Ron Cowen

  4. Brains disconnect as people sleep

    Rather than turning off completely during sleep, the brain shuts down communication among structures that make up neural networks.