News

  1. Health & Medicine

    High doses

    Emergency room patients are exposed to high doses of radiation from CT scans and other nuclear medicine.

    By Tia Ghose
  2. Life

    Tracing human roots

    Using a new method of data analysis, researchers have found that the Americas were peopled in two different migrations.

    By Tia Ghose
  3. Climate

    Already feeling the heat

    Long-delayed U.S. government summary of climate change science sees effects on energy, transportation, farming, and water.

    By Susan Milius
  4. Planetary Science

    Rarin’ to go

    After a day’s delay, the robotic arm on the Mars Phoenix Lander is free of its shackles and is preparing to dig for ice.