News

  1. Life

    Dinos straddled line between cold- and warm-blooded

    Tyrannosaurus rex and other dinosaurs straddled line between cold- and warm-blood, a new analysis finds.

    By Meghan Rosen
  2. Genetics

    Chimp and human lineages may have split twice as long ago as thought

    New estimates of chimpanzee mutation rates suggest humans and chimps last shared a common ancestor 13 million years ago.

    By Tina Hesman Saey
  3. Health & Medicine

    Number of skin moles tied to breast cancer risk

    Women who have many moles also have increased disease risk, which may reflect higher estrogen levels.

    By Nathan Seppa
  4. Animals

    Winter road salting reshapes next summer’s butterflies

    Winter road salt treatments boost sodium in roadside plants and alter development for monarch butterflies.