Uncategorized

  1. Health & Medicine

    President reverses federal ban on stem cell funding

    President Barack Obama signed an executive order lifting a ban on federal funding for research that uses embryonic stem cells.

    By Janet Raloff
  2. Space

    Frozen cosmic fingerprints

    Researchers claim to find evidence of 11th century supernovas and the solar cycle in an ice core.

    By Ron Cowen
  3. Math

    The four color problem gets a sharp new hue

    Mathematicians find new answers to the still puzzling theorem that four colors suffice to color any map.

    By Julie Rehmeyer
  4. Climate

    Chinese carbon dioxide emissions eclipse efficiency gains

    A boost in manufacturing and construction in China led to an increase in carbon dioxide emissions that outstripped any gains from increased energy efficiency.