News

  1. Health & Medicine

    New embryonic stem cells ratted out

    Overcoming obstacles, scientists have created stable embryonic stem cells from rats. Researchers hope their method will prove useful as a general recipe for isolating stem cells from other mammals.

    By Laura Sanders
  2. Health & Medicine

    Hot clock key to fruit fly’s global spread

    A temperature-sensitive switch in a fruit fly’s biological clock means some species can survive in a wide range of climates while others are stuck on the equator.

    By Tina Hesman Saey
  3. Space

    Lopsided universe demands different explanation

    Cosmologists analyzing an apparent asymmetry in the pattern of radiation reveal evidence for a new type of field in the early universe.