News

  1. Health & Medicine

    Tired brain defaults differently

    Sleep deprivation may cause the brain to switch to default mode when it should be paying attention.

    By Tina Hesman Saey
  2. Health & Medicine

    Junior moments

    A new study finds that young adults actually had more "senior moments" than did older people.

    By Tina Hesman Saey
  3. Animals

    Dogs show a fetching communication savvy

    In a sign of understanding that one object can be used to represent another, border collies fetch toys after being shown replicas or, in some cases, photos of those toys.

    By Bruce Bower
  4. Space

    Brines on Mars

    Unusually high concentration of perchlorate salts found in Martian soil suggests that the Red Planet may harbor shallow, extremely briny oceans just below its surface.