News

  1. Earth

    Prenatal nicotine: A role in SIDS?

    New data suggest why exposure to nicotine in the womb can put an infant at greater risk of sudden infant death syndrome.

    By Janet Raloff
  2. Health & Medicine

    Little vessels react to magnetic switch

    Magnets can act like vascular switches, increasing or decreasing blood flow to a region of the body.

    By Janet Raloff
  3. Earth

    Traces of lead cause outsize harm

    Minute amounts of lead in blood are worse for children than had been realized.

    By Ben Harder
  4. Paleontology

    Ancestors Go South

    A group of new and previously excavated fossils in South Africa represents 4-million-year-old members of the human evolutionary family, according to an analysis of the sediment that covered the finds.