THE GOOD NEWS
-- Clean-needle-exchange programs intended to help prevent the spread of AIDS by reducing needle sharing are controversial because some believe they may encourage drug addiction. New research has shown that exchange programs in the U.S. and nine other nations caused a drop in dangerous needle sharing but did not increase drug use.
-- A transplant of blood from the umbilical cord of an unrelated donor has apparently helped restore the bone marrow of a three-year-old with leukemia. Umbilical blood is rich in marrow-producing cells; previously, doctors had used it successfully only when it had been taken from the...
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