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  1. Distressed amoebas can call for help

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

    By Jessa Netting
  2. 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
  3. Earth

    Leaden calcium supplements

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

    By Janet Raloff

  4. 18920

    I was disappointed in “Blood relatives.” It ignored the pioneering work by people at the company Somatogen, now known as Baxter Hemoglobin Therapeutics. They first published work on a recombinant hemoglobin for use as a blood substitute in Nature in 1990.