News

  1. Life

    Cells renew in the human heart

    Carbon 14 from Cold War–era nuclear bomb tests allowed researchers to track cell birth.

    By Laura Sanders
  2. Chemistry

    Prions are common, at least in yeast

    A new study of shape-shifting proteins in baker’s yeast reveals that prions are common and may help organisms survive in changing conditions.

    By Tina Hesman Saey
  3. Health & Medicine

    HPV screen beats Pap smear

    A test for human papillomavirus outperforms the standard Pap smear in catching precancerous cervical lesions, a study of women age 30 and over shows.

    By Nathan Seppa
  4. Space

    Heavyweight galaxies in the young universe

    New observations of full-grown galaxies in the young universe may force astrophysicists to revise their leading theory of galaxy formation, at least as it applies to regions where galaxies congregate into clusters.