News

  1. Health & Medicine

    Arsenic helps tumors, blood vessels grow

    Rather than being a potential antitumor agent, arsenic may actually help a tumor's supporting network of blood vessels thrive.

    By Ben Harder
  2. Astronomy

    Stellar finding may outshine all others

    Astronomers have found what may be the heaviest, biggest, and brightest star ever observed.

    By Ron Cowen
  3. Earth

    Farmed salmon bring PCBs to the table

    High concentrations of chlorinated organic contaminants in farm-raised Atlantic salmon may warrant limiting consumption of the otherwise-healthful fish to no more than once per month.

    By Ben Harder
  4. Earth

    Air held oxygen early on

    Chemical analyses of South African sediments suggest that oxygen was present in small quantities about 2.32