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  1. Climate

    Ancient Norse colonies hit bad climate times

    Temperatures in Iceland plummeted soon after settlers arrived, a new chemical analysis suggests.

    By Alexandra Witze
  2. Life

    Chameleon tongues snappy even when cold

    Collagen gives the creatures a bug-catching advantage in chilly conditions.

    By Sid Perkins
  3. Life

    Boys and girls differ in genetic response to what mom eats

    Expectant mothers’ diets may influence gene activity differently in the placentas that feed sons and daughters, a new mouse study reveals.

    By Tina Hesman Saey
  4. Health & Medicine

    Gene linked to pain perception

    A common genetic variant that appears to increase sensitivity could lead to the development of better medications.