News

  1. Health & Medicine

    U.S. childhood obesity rate continues to rise

    Only a few states buck the trend toward greater weight gain in kids age 10 to 17, a new survey shows.

    By Nathan Seppa
  2. Earth

    Gulf oil spill a slow-motion hurricane

    The accident’s timing could determine how badly it damages coastal marshes.

    By Janet Raloff
  3. Health & Medicine

    Epigenetic changes show up in people with PTSD

    Study finds alterations in genes tied to immune system and brain development, but whether they cause the disorder remains unclear.

    By Nathan Seppa
  4. Physics

    Making clouds with lasers

    Inspired by a classic particle physics experiment, researchers get water droplets to condense by shooting a light beam skyward.