News

  1. DNA-cutting enzyme looks like scissors

    One type of restriction enzyme not only cuts a DNA strand but also looks like a pair of scissors.

    By Jessa Netting

  2. Distressed amoebas can call for help

    Amoebas having trouble dividing produce a chemical signal that draws other amoebas to the scene.

    By Jessa Netting
  3. Earth

    POPs in the butter

    Governments may be able to monitor trends in the release and transport of persistent organic pollutants by sampling butter.

    By Janet Raloff
  4. Earth

    Leaden calcium supplements

    Consuming calcium along with lead limits, and may prevent, the body's absorption of the toxicant.

    By Janet Raloff

  5. Did males get bigger or females smaller?

    It's time to stop assuming that standard gender differences in birds come from males getting bigger rather than from females getting smaller.