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  1. Health & Medicine

    Do liver stem cells come from bone marrow?

    Tests of liver tissue from people who've received liver or blood-marrow transplants show that stem cells in bone marrow can populate the liver as liver cells.

    By Nathan Seppa
  2. Materials Science

    Conch yields clues for future materials

    A conch's tough, calcium carbonate shell resists fractures because a protein surrounds the mineral crystals throughout the shell.

    By Jessica Gorman

  3. Prenatal problems linked to schizophrenia

    Three large, long-term studies found that periods of oxygen deprivation in the fetus, along with obesity and second-trimester respiratory infections in the mother, are associated with adult schizophrenia.

    By Bruce Bower

  4. 19160

    I found the “stats” about blood donors and patients in this article misleading, with the implication that 8 million volunteer donors are more than enough for 4.5