News

  1. Anthropology

    Y Trail of the First Americans: DNA data point to late New World entry

    Scientists identified a gene variant on the Y chromosome that allowed them to estimate that people first reached the Americas no earlier than about 18,000 years ago.

    By Bruce Bower
  2. Earth

    Volcanic Legacy: Tortoises chronicle eruption in their genes

    An ancient volcanic eruption in the Galápagos Islands left its legacy in the diminished genetic diversity of one subspecies of the archipelago's famed giant tortoises.

    By Sid Perkins
  3. Animals

    Carnivores in Captivity: Size of range in wild may predict risk in zoo

    A survey of zoo reports of troubled animals suggests that the minimum size of a species' range predicts how well it will adapt to captivity.