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  1. Health & Medicine

    HIV in breast milk can be drug resistant

    HIV-positive women who receive the drug nevirapine during pregnancy often have HIV that is resistant to the drug in their breast milk after they give birth.

    By Nathan Seppa
  2. Health & Medicine

    Designer RNA stalls hepatitis in mice

    Using strips of synthetic RNA that interfere with normal gene action, scientists working with mice have stopped the progression of hepatitis.

    By Nathan Seppa

  3. Dolly, first cloned mammal, is dead

    Dolly, the first clone of an adult mammal, has been euthanized after acquiring a severe lung infection.

    By John Travis
  4. Materials Science

    Ceramic rebounds from stressful situations

    The ceramic titanium silicon carbide can fully recover after being compressed to a degree that would leave most ceramics shattered and most metals permanently deformed.