Uncategorized

  1. 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
  2. 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.

    By Sid Perkins
  3. Earth

    Buckyballs do antimicrobial magic

    A new study shows that soccer-ball–shaped carbon nanoparticles can prevent biofilm from gunking up water filters.

    By Laura Sanders
  4. Physics

    When the ink hits the page

    Scientists investigate the physics of the most printable ink and find the most viscous inks don’t make the grade.